AC_PREREQ(2.59)

dnl ================================================================
dnl XXX: If you are making a release then you need to check these
dnl sections:
dnl » API versions (Only the 1.x version needs to change)
dnl   (the pretty numbers that the users see)
dnl
dnl » Interface version details for libtool
dnl   (the shared library versioning information)
dnl
dnl » Source code release status
dnl   (mark the source code as being part of a "release" or from "git")
dnl ================================================================

dnl ================================================================
dnl API versions (i.e. the pretty numbers that users see)
dnl ================================================================
m4_define([cogl_major_version], [2])
m4_define([cogl_minor_version], [0])
m4_define([cogl_micro_version], [0])
m4_define([cogl_version],
          [cogl_major_version.cogl_minor_version.cogl_micro_version])

dnl Since the core Cogl library has to also maintain support for the
dnl Cogl 1.x API for Clutter then we track the 1.x version separately.
m4_define([cogl_1_minor_version], [13])
m4_define([cogl_1_micro_version], [1])
m4_define([cogl_1_version], [1.cogl_1_minor_version.cogl_1_micro_version])

dnl ================================================================
dnl Interface version details for libtool
dnl ================================================================
# Note: we don't automatically deduce the libtool version info from
# the pretty version number that users sees. This is because we want
# to update the pretty version number before making a release since it
# can affect the name of our pkg-config file and the naming or
# location of other installed files which we want to be able to verify
# as correct well before making a release.
#
# For reference on how the various numbers should be updated at
# release time these rules are adapted from the libtool info pages:
#
#  1. Update the version information only immediately before a public
#     release.
#
#  2. If the library source code has changed at all since the last
#     update, then increment REVISION (`C:R:A' becomes `C:r+1:A').
#
#  3. If any interfaces have been added, removed, or changed since the
#     last update, increment CURRENT, and set REVISION to 0.
#
#  4. If any interfaces have been added since the last public release,
#     then increment AGE.
#
#  5. If any interfaces have been removed since the last public release,
#     then set AGE to 0.
m4_define([cogl_lt_current], 11)
m4_define([cogl_lt_revision], 3)
m4_define([cogl_lt_age], 0)
# We do also tell libtool the pretty version:
m4_define([cogl_lt_release], [cogl_version])


dnl ================================================================
dnl Source code release status
dnl ================================================================
# Finally we explicitly track when we are building development source
# from Git vs building source corresponding to a release. As with the
# libtool version info we don't automatically derive this from the
# pretty version number because we want to test the results of
# updating the version number in advance of a release.
m4_define([cogl_release_status], [git])

AC_INIT(cogl, [cogl_1_version])
AC_CONFIG_SRCDIR(cogl/cogl.h)
AC_CONFIG_AUX_DIR([build])
AC_CONFIG_MACRO_DIR([build/autotools])
AC_CONFIG_HEADERS(config.h)
AC_GNU_SOURCE

dnl ================================================================
dnl Required versions for dependencies
dnl ================================================================
m4_define([glib_req_version],           [2.32.0])
m4_define([pangocairo_req_version],     [1.20])
m4_define([gi_req_version],             [0.9.5])
m4_define([gdk_pixbuf_req_version],     [2.0])
m4_define([uprof_req_version],          [0.3])
m4_define([gtk_doc_req_version],        [1.13])
m4_define([xfixes_req_version],         [3])
m4_define([xcomposite_req_version],     [0.4])
m4_define([cairo_req_version],          [1.10])

dnl These variables get copied into the generated README
AC_SUBST([GLIB_REQ_VERSION], [glib_req_version])
AC_SUBST([GDK_PIXBUF_REQ_VERSION], [gdk_pixbuf_req_version])
AC_SUBST([CAIRO_REQ_VERSION], [cairo_req_version])
AC_SUBST([PANGOCAIRO_REQ_VERSION], [pangocairo_req_version])
AC_SUBST([XCOMPOSITE_REQ_VERSION], [xcomposite_req_version])
AC_SUBST([XFIXES_REQ_VERSION], [xfixes_req_version])
AC_SUBST([GTK_DOC_REQ_VERSION], [gtk_doc_req_version])
AC_SUBST([GI_REQ_VERSION], [gi_req_version])
AC_SUBST([UPROF_REQ_VERSION], [uprof_req_version])

# Save this value here, since automake will set cflags later and we
# want to know if the user specified custom cflags or not.
cflags_set=${CFLAGS+set}

AM_INIT_AUTOMAKE([1.11 foreign -Wno-portability no-define no-dist-gzip
                  dist-bzip2 tar-ustar])
AM_SILENT_RULES([yes])

AH_BOTTOM([#include "config-custom.h"])

dnl ================================================================
dnl Export the API versioning
dnl ================================================================
AC_SUBST([COGL_MAJOR_VERSION],[cogl_major_version])
AC_SUBST([COGL_MINOR_VERSION],[cogl_minor_version])
AC_SUBST([COGL_MICRO_VERSION],[cogl_micro_version])
AC_SUBST([COGL_VERSION],[cogl_version])
AC_SUBST([COGL_API_VERSION],[cogl_major_version.0])
AC_SUBST([COGL_API_VERSION_AM],[$COGL_MAJOR_VERSION\_0])

AC_SUBST([COGL_1_MINOR_VERSION],[cogl_1_minor_version])
AC_SUBST([COGL_1_MICRO_VERSION],[cogl_1_micro_version])
AC_SUBST([COGL_1_VERSION],[cogl_1_version])


dnl ================================================================
dnl Export the libtool versioning
dnl ================================================================
AC_SUBST([COGL_LT_CURRENT], [cogl_lt_current])
AC_SUBST([COGL_LT_REVISION], [cogl_lt_revision])
AC_SUBST([COGL_LT_AGE], [cogl_lt_age])
AC_SUBST([COGL_LT_RELEASE], [cogl_lt_release])


dnl ================================================================
dnl Export the source code release status
dnl ================================================================
AC_SUBST([COGL_RELEASE_STATUS], [cogl_release_status])

dnl ================================================================
dnl Compiler stuff.
dnl ================================================================
AC_PROG_CC
AC_PROG_CPP
AC_PROG_CXX
AM_PROG_CC_C_O
AC_ISC_POSIX
AC_C_CONST

dnl     ============================================================
dnl     Compiler features
dnl     ============================================================
AC_MSG_CHECKING([for _Static_assert])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([_Static_assert (1, "");],
                                   [(void) 0])],
                  [AC_DEFINE([HAVE_STATIC_ASSERT], [1],
                             [Whether _Static_assert can be used or not])
                   AC_MSG_RESULT([yes])],
                  [AC_MSG_RESULT([no])])

dnl ================================================================
dnl Libtool stuff.
dnl ================================================================
dnl AC_PROG_LIBTOOL
dnl LIBTOOL="$LIBTOOL --preserve-dup-deps"
LT_PREREQ([2.2.6])
LT_INIT([disable-static])
dnl when using libtool 2.x create libtool early, because it's used in the
dnl internal glib configure (as-glibconfig.m4)
m4_ifdef([LT_OUTPUT], [LT_OUTPUT])

dnl ================================================================
dnl See what platform we are building for
dnl ================================================================
AC_CANONICAL_HOST
AC_MSG_CHECKING([if building for some Win32 platform])
AS_CASE([$host],
        [*-*-mingw*|*-*-cygwin*],
        [
          COGL_EXTRA_LDFLAGS="$COGL_EXTRA_LDFLAGS -no-undefined"
          platform_win32=yes
        ],

        [platform_win32=no]
)
AC_MSG_RESULT([$platform_win32])
AM_CONDITIONAL(OS_WIN32, [test "$platform_win32" = "yes"])

AC_CHECK_HEADER([OpenGL/gl.h], [platform_quartz=yes], [platform_quartz=no])
AM_CONDITIONAL(OS_QUARTZ, [test "$platform_quartz" = "yes"])

dnl ================================================================
dnl Handle extra configure options
dnl ================================================================

dnl     ============================================================
dnl     Standalone cogl
dnl     ============================================================

AC_ARG_ENABLE(
  [standalone],
  [AC_HELP_STRING([--enable-debug=@<:@no/yes@:>@], [Build Cogl without any external depedency @<:@default=no@:>@])],
  [],
  enable_standalone=no
)
AS_IF([test "x$enable_standalone" = "xyes"],
      [
        enable_cairo=no
        enable_glib=no
        enable_cogl_pango=no
        enable_nls=no
        enable_gdk_pixbuf=no
       ]
)

dnl     ============================================================
dnl     Enable debugging
dnl     ============================================================
m4_define([debug_default], [m4_if(cogl_release_status, [git], [yes], [no])])
AC_ARG_ENABLE(
  [debug],
  [AC_HELP_STRING([--enable-debug=@<:@no/yes@:>@], [Control Cogl debugging level @<:@default=]debug_default[@:>@])],
  [],
  enable_debug=debug_default
)
AS_CASE(
  [$enable_debug],
  [yes],
  [
    test "$cflags_set" = set || CFLAGS="$CFLAGS -g -O0"
    COGL_EXTRA_CFLAGS="$COGL_EXTRA_CFLAGS -DCOGL_GL_DEBUG -DCOGL_OBJECT_DEBUG -DCOGL_ENABLE_DEBUG"
  ],
  [no],
  [
    COGL_EXTRA_CFLAGS="$COGL_EXTRA_CFLAGS -DG_DISABLE_CHECKS -DG_DISABLE_CAST_CHECKS"
  ],
  [AC_MSG_ERROR([Unknown argument for --enable-debug])]
)

AC_SUBST(COGL_DEBUG_CFLAGS)


dnl     ============================================================
dnl     Enable cairo usage for debugging
dnl       (debugging code can use cairo to dump the atlas)
dnl     ============================================================

PKG_CHECK_EXISTS([CAIRO], [cairo >= cairo_req_version], [have_cairo=yes])
AC_ARG_ENABLE(
  [cairo],
  [AC_HELP_STRING([--enable-cairo=@<:@no/yes@:>@], [Control Cairo usage in Cogl debugging code @<:@default=auto@:>@])],
  [],
  [
    AS_IF([test "x$enable_debug" = "xyes"],
          [enable_cairo=$have_cairo],
          [enable_cairo=no])
  ]
)
AS_IF([test "x$enable_cairo" = "xyes" && test "x$enable_debug" = "xyes"],
      [
        AS_IF([test "x$have_cairo" != "xyes"],
              [AC_MSG_ERROR([Could not find Cairo])])

        COGL_PKG_REQUIRES="$COGL_PKG_REQUIRES cairo >= cairo_req_version"
        AC_DEFINE([HAVE_CAIRO], [1], [Whether we have cairo or not])
      ])


dnl     ============================================================
dnl     Enable profiling
dnl     ============================================================
AC_ARG_ENABLE(profile,
              [AC_HELP_STRING([--enable-profile=@<:@no/yes@:>@],
                             [Turn on uprof profiling support. yes; All UProf profiling probe points are compiled in and may be runtime enabled. no; No profiling support will built into cogl.  @<:@default=no@:>@])],
              [],
              [enable_profile=no])
AS_IF([test "x$enable_profile" = "xyes"],
      [
        AS_IF([test "x$GCC" = "xyes"],
              [
                COGL_PKG_REQUIRES="$COGL_PKG_REQUIRES uprof-0.3"
                COGL_EXTRA_CFLAGS="$COGL_EXTRA_CFLAGS -DCOGL_ENABLE_PROFILE"
                AS_IF([test "x$enable_debug" = "xyes"], [COGL_EXTRA_CFLAGS="$COGL_EXTRA_CFLAGS -DUPROF_DEBUG"])
              ],
              [
                AC_MSG_ERROR([--enable-profile is currently only supported if using GCC])
              ])
      ])
AM_CONDITIONAL(PROFILE, test "x$enable_profile" != "xno")


dnl     ============================================================
dnl     Enable strict compiler flags
dnl     ============================================================

# use strict compiler flags only when building from git; the rules for
# distcheck will take care of turning this on when making a release
m4_define([maintainer_default], [m4_if(cogl_release_status, [git], [yes], [no])])
AC_ARG_ENABLE(
  [maintainer-flags],
  [AC_HELP_STRING([--enable-maintainer-flags=@<:@no/yes/error@:>@], [Use strict compiler flags @<:@default=]maintainer_default[@:>@])],
  [],
  enable_maintainer_flags=maintainer_default
)

MAINTAINER_COMPILER_FLAGS="-Wall -Wcast-align -Wuninitialized
                           -Wno-strict-aliasing -Wempty-body -Wformat
                           -Wformat-security -Winit-self -Wundef
                           -Wdeclaration-after-statement -Wvla
                           -Wpointer-arith -Wmissing-declarations"

AS_CASE(
  [$enable_maintainer_flags],
  [yes],
  [
    AS_COMPILER_FLAGS([MAINTAINER_CFLAGS], [$MAINTAINER_COMPILER_FLAGS])
  ],
  [no],
  [
  ],
  [error],
  [
    MAINTAINER_COMPILER_FLAGS="$MAINTAINER_COMPILER_FLAGS -Werror"
    AS_COMPILER_FLAGS([MAINTAINER_CFLAGS], [$MAINTAINER_COMPILER_FLAGS])
  ],
  [*],
  [AC_MSG_ERROR([Invalid option for --enable-maintainer-flags])]
)

# strip leading spaces
COGL_EXTRA_CFLAGS="$COGL_EXTRA_CFLAGS ${MAINTAINER_CFLAGS#*  }"


dnl     ============================================================
dnl     Enable deprecation guards
dnl     ============================================================

# disable deprecated options from Glib only when building from git;
# the rules for distcheck will take care of turning this on when
# making a release
m4_define([deprecated_default],
          [m4_if(cogl_release_status, [git], [no], [yes])])

AC_ARG_ENABLE([deprecated],
              [AS_HELP_STRING([--enable-deprecated=@<:@no/yes@:>@],
                              [Whether deprecated symbols should be disabled when compiling Cogl @<:@default=]deprecated_default[@:>@])],
              [],
              [enable_deprecated=deprecated_default])

AS_CASE([$enable_deprecated],

        [no],
        [
          DEPRECATED_CFLAGS="-DG_DISABLE_DEPRECATED -DG_DISABLE_SINGLE_INCLUDES"
        ],

        [yes],
        [
          DEPRECATED_CFLAGS=""
        ],

        [AC_MSG_ERROR([Unknown argument for --enable-deprecated])]
)

# strip leading spaces
COGL_EXTRA_CFLAGS="$COGL_EXTRA_CFLAGS ${DEPRECATED_CFLAGS#*  }"

dnl ================================================================
dnl Check for dependency packages.
dnl ================================================================

dnl     ============================================================
dnl     Should glib be used?
dnl     ============================================================
AM_PATH_GLIB_2_0([glib_req_version],
                 [have_glib=yes], [have_glib=no],
                 [gobject gthread gmodule-no-export])
AC_ARG_ENABLE(
  [glib],
  [AC_HELP_STRING([--enable-glib=@<:@no/yes@:>@], [Enable glib support @<:@default=yes@:>@])],
  [],
  enable_glib=yes
)

AS_IF([test "x$have_glib" = "xno" && test "x$enable_glib" = "xyes"],
      [AC_MSG_ERROR([gobject-2.0 is required])])

AM_CONDITIONAL([USE_GLIB], [test "x$enable_glib" = "xyes"])

AS_IF([test "x$enable_glib" = "xyes"],
      [
        COGL_DEFINES_SYMBOLS="$COGL_DEFINES_SYMBOLS COGL_HAS_GLIB_SUPPORT"
        COGL_DEFINES_SYMBOLS="$COGL_DEFINES_SYMBOLS COGL_HAS_GTYPE_SUPPORT"
        COGL_PKG_REQUIRES="$COGL_PKG_REQUIRES gobject-2.0 gmodule-no-export-2.0"
      ],
      [
        AS_GLIBCONFIG([deps/glib])
        COGL_EXTRA_CFLAGS="$COGL_EXTRA_CFLAGS -I\$(top_srcdir)/deps"
        COGL_EXTRA_CFLAGS="$COGL_EXTRA_CFLAGS -I\$(top_builddir)/deps"
        COGL_EXTRA_CFLAGS="$COGL_EXTRA_CFLAGS -I\$(top_srcdir)/deps/glib"
        COGL_EXTRA_CFLAGS="$COGL_EXTRA_CFLAGS -I\$(top_builddir)/deps/glib"
        COGL_EXTRA_CFLAGS="$COGL_EXTRA_CFLAGS -I\$(top_srcdir)/deps/gmodule"
        COGL_EXTRA_CFLAGS="$COGL_EXTRA_CFLAGS -I\$(top_builddir)/deps/gmodule"
        EXPERIMENTAL_CONFIG=yes
        EXPERIMENTAL_OPTIONS="$EXPERIMENTAL_OPTIONS --disable-glib,"
        enable_nls=no
      ]
)

dnl     ============================================================
dnl     Should cogl-pango be built?
dnl     ============================================================

AS_IF([test "x$enable_glib" != "xyes"],
      [
        AS_IF([test "x$enable_cogl_pango" = "xyes"],
              AC_MSG_ERROR([--enable-cogl-pango conflicts with --disable-glib]))
        enable_cogl_pango=no
      ]
)

AC_ARG_ENABLE(
  [cogl-pango],
  [AC_HELP_STRING([--enable-cogl-pango=@<:@no/yes@:>@], [Enable pango support @<:@default=yes@:>@])],
  [],
  enable_cogl_pango=yes
)
AS_IF([test "x$enable_cogl_pango" = "xyes"],
      [
	COGL_PANGO_PKG_REQUIRES="$COGL_PANGO_PKG_REQUIRES pangocairo >= pangocairo_req_version"
      ]
)

dnl     ============================================================
dnl     Choose image loading backend
dnl     ============================================================
AC_ARG_ENABLE(
  [gdk-pixbuf],
  [AC_HELP_STRING([--enable-gdk-pixbuf=@<:@no/yes@:>@], [Enable image loading via gdk-pixbuf @<:@default=yes@:>@])],
  [],
  [AS_IF([test "x$enable_glib" = "xyes"],
         [PKG_CHECK_EXISTS([gdk-pixbuf-2.0 >= gdk_pixbuf_req_version],
                           [enable_gdk_pixbuf=yes],
                           [enable_gdk_pixbuf=no])])]
)

AC_ARG_ENABLE(
  [quartz-image],
  [AC_HELP_STRING([--enable-quartz-image=@<:@no/yes@:>@], [Enable image loading via quartz @<:@default=no@:>@])],
  [],
  enable_quartz_image=no
)

AS_IF(
  [test "x$enable_gdk_pixbuf" = "xyes"],
  [
    AS_IF([test "x$enable_glib" != "xyes"],
          [AC_MSG_ERROR([--disable-glib conflicts with --enable-gdk-pixbuf])])
    AC_DEFINE([USE_GDKPIXBUF], 1, [Use GdkPixbuf for loading image data])
    COGL_PKG_REQUIRES="$COGL_PKG_REQUIRES gdk-pixbuf-2.0 >= gdk_pixbuf_req_version"
    COGL_IMAGE_BACKEND="gdk-pixbuf"
  ],
  [test "x$enable_quartz_image" = "xyes"],
  [
    EXPERIMENTAL_CONFIG=yes
    EXPERIMENTAL_OPTIONS="$EXPERIMENTAL_OPTIONS Quartz Core Graphics,"
    AC_DEFINE([USE_QUARTZ], 1,
	      [Use Core Graphics (Quartz) for loading image data])
    COGL_IMAGE_BACKEND="quartz"
  ],
  [
    EXPERIMENTAL_CONFIG=yes
    EXPERIMENTAL_OPTIONS="$EXPERIMENTAL_OPTIONS fallback image decoding (stb_image),"
    AC_DEFINE([USE_INTERNAL], 1,
	      [Use internal image decoding for loading image data])
    COGL_IMAGE_BACKEND="stb_image"
  ]
)

dnl     ============================================================
dnl     Should examples be installed?
dnl     ============================================================
AC_ARG_ENABLE(
  [examples-install],
  [AC_HELP_STRING([--enable-examples-install=@<:@no/yes@:>@], [Enable installation of examples @<:@default=no@:>@])],
  [],
  enable_examples_install=no
)
AM_CONDITIONAL([INSTALL_EXAMPLES], [test "x$enable_examples_install" = "xyes"])

dnl     ============================================================
dnl     Determine which drivers and window systems we can support
dnl     ============================================================

dnl         ========================================================
dnl         Drivers first...
dnl         ========================================================
EGL_CHECKED=no

dnl This gets set to yes if Cogl directly links to the GL library API
dnl so it doesn't need to be dlopened. This currently happens on OSX
dnl and WGL where it's not clear if window system API can be separated
dnl from the GL API.
GL_LIBRARY_DIRECTLY_LINKED=no

enabled_drivers=""

HAVE_GLES1=0
AC_ARG_ENABLE(
  [gles1],
  [AC_HELP_STRING([--enable-gles1=@<:@no/yes@:>@], [Enable support for OpenGL-ES 1.1 @<:@default=no@:>@])],
  [],
  enable_gles1=no
)
AS_IF([test "x$enable_gles1" = "xyes"],
      [
        AS_IF([test "x$platform_win32" = "xyes"],
	      [AC_MSG_ERROR([GLES 1 not available for win32])])

        enabled_drivers="$enabled_drivers gles1"

        cogl_gl_headers="GLES/gl.h GLES/glext.h"

        AC_DEFINE([HAVE_COGL_GLES], 1, [Have GLES 1.1 for rendering])
        COGL_DEFINES_SYMBOLS="$COGL_DEFINES_SYMBOLS COGL_HAS_GLES CLUTTER_COGL_HAS_GLES"
        COGL_DEFINES_SYMBOLS="$COGL_DEFINES_SYMBOLS COGL_HAS_GLES1"
        HAVE_GLES1=1

        PKG_CHECK_EXISTS([glesv1_cm],
          [COGL_PKG_REQUIRES_GL="$COGL_PKG_REQUIRES_GL glesv1_cm"
           COGL_GLES1_LIBNAME="libGLESv1_CM.so"
          ],
          [
            # We have to check the two headers independently as GLES/glext.h
            # needs to include GLES/gl.h to have the GL types defined (eg.
            # GLenum).
            AC_CHECK_HEADER([GLES/gl.h],
                            [],
                            [AC_MSG_ERROR([Unable to locate GLES/gl.h])])
            AC_CHECK_HEADER([GLES/glext.h],
                            [],
                            [AC_MSG_ERROR([Unable to locate GLES/glext.h])],
                            [#include <GLES/gl.h>])

            # Early implementations provided only a GLES/egl.h while Khronos's
            # implementer guide now states EGL/egl.h is the One. Some
            # implementations keep a GLES/egl.h wrapper around EGL/egl.h for
            # backward compatibility while others provide EGL/egl.h only.
            AC_CHECK_HEADERS([GLES/egl.h EGL/egl.h])

            AS_IF([test "x$ac_cv_header_GLES_egl_h" = "xyes"],
                  [COGL_EGL_INCLUDES="#include <GLES/egl.h>"],
                  [test "x$ac_cv_header_EGL_egl_h" = "xyes"],
                  [
                    COGL_EGL_INCLUDES="#include <EGL/egl.h>"
                  ],
                  [AC_MSG_ERROR([Unable to locate EGL header])])
            AC_SUBST([COGL_EGL_INCLUDES])

            AC_CHECK_HEADERS([EGL/eglext.h],
                             [COGL_EGL_INCLUDES="$COGL_EGL_INCLUDE
#include <EGL/eglext.h>"],
                             [],
                             [$COGL_EGL_INCLUDES])

            # Check for a GLES 1.x Common Profile library with/without EGL.
            #
            # Note: historically GLES 1 libraries shipped with the
            # EGL and GLES symbols all bundled in one library. Now
            # the Khronos Implementers Guide defines two naming
            # schemes: -lGLES_CM should be used for a library that
            # bundles the GLES and EGL API together and -lGLESv1_CM
            # would be used for a standalone GLES API.
            AC_CHECK_LIB(GLES_CM, [eglInitialize],
              [COGL_GLES1_LIBNAME="libGLES_CM.so"],
              [
                AC_CHECK_LIB(GLESv1_CM, [glFlush],
                  [COGL_GLES1_LIBNAME="libGLESv1_CM.so"
                   NEED_SEPARATE_EGL=yes
                  ],
                  [AC_MSG_ERROR([Unable to locate required GLES 1.x Common Profile library])])
              ])

            EGL_CHECKED=yes
          ])
      ])

HAVE_GLES2=0
AC_ARG_ENABLE(
  [gles2],
  [AC_HELP_STRING([--enable-gles2=@<:@no/yes@:>@], [Enable support for OpenGL-ES 2.0 @<:@default=no@:>@])],
  [],
  enable_gles2=no
)
AS_IF([test "x$enable_gles2" = "xyes"],
      [
        AS_IF([test "x$platform_win32" = "xyes"],
	      [AC_MSG_ERROR([GLES 2 not available for win32])])

        enabled_drivers="$enabled_drivers gles2"

        cogl_gl_headers="GLES2/gl2.h GLES2/gl2ext.h"
        AC_DEFINE([HAVE_COGL_GLES2], 1, [Have GLES 2.0 for rendering])
        COGL_DEFINES_SYMBOLS="$COGL_DEFINES_SYMBOLS COGL_HAS_GLES CLUTTER_COGL_HAS_GLES"
        COGL_DEFINES_SYMBOLS="$COGL_DEFINES_SYMBOLS COGL_HAS_GLES2"
        HAVE_GLES2=1

        PKG_CHECK_EXISTS([glesv2],
          [COGL_PKG_REQUIRES_GL="$COGL_PKG_REQUIRES_GL glesv2"
           COGL_GLES2_LIBNAME="libGLESv2.so"
          ],
          [
            # We have to check the two headers independently as GLES2/gl2ext.h
            # needs to include GLES2/gl2.h to have the GL types defined (eg.
            # GLenum).
            AC_CHECK_HEADER([GLES2/gl2.h],
                            [],
                            [AC_MSG_ERROR([Unable to locate GLES2/gl2.h])])
            AC_CHECK_HEADER([GLES2/gl2ext.h],
                            [],
                            [AC_MSG_ERROR([Unable to locate GLES2/gl2ext.h])],
                            [#include <GLES2/gl2.h>])

            COGL_GLES2_LIBNAME="libGLESv2.so"
          ])
      ])

HAVE_GL=0
AC_ARG_ENABLE(
  [gl],
  [AC_HELP_STRING([--enable-gl=@<:@no/yes@:>@], [Enable support for OpenGL @<:@default=yes@:>@])],
  [],
  [enable_gl=yes]
)
AS_IF([test "x$enable_gl" = "xyes"],
      [
        enabled_drivers="$enabled_drivers gl"

        PKG_CHECK_EXISTS([x11], [ALLOW_GLX=yes])

        cogl_gl_headers="GL/gl.h"

        AS_IF([test "x$platform_quartz" = "xyes"],
              [
                cogl_gl_headers="OpenGL/gl.h"
                COGL_EXTRA_LDFLAGS="$COGL_EXTRA_LDFLAGS -framework OpenGL"
                dnl The GL API is being directly linked in so there is
                dnl no need to dlopen it separately
                GL_LIBRARY_DIRECTLY_LINKED=yes
                COGL_GL_LIBNAME=""
              ],

              [test "x$platform_win32" = "xyes"],
	      [
		COGL_EXTRA_LDFLAGS="$COGL_EXTRA_LDFLAGS -lopengl32 -lgdi32 -lwinmm"
		COGL_EXTRA_CFLAGS="$COGL_EXTRA_CFLAGS -D_WIN32_WINNT=0x0500"
                ALLOW_WGL=yes
                dnl The GL API is being directly linked in so there is
                dnl no need to dlopen it separately
                GL_LIBRARY_DIRECTLY_LINKED=yes
                COGL_GL_LIBNAME=""
	      ],

	      [
		PKG_CHECK_EXISTS([gl],
                  dnl We don't want to use COGL_PKG_REQUIRES here because we don't want to
                  dnl directly link against libGL
                  [COGL_PKG_REQUIRES_GL="$COGL_PKG_REQUIRES_GL gl"],
		  [AC_CHECK_LIB(GL, [glGetString],
				,
				[AC_MSG_ERROR([Unable to locate required GL library])])
		  ])
                COGL_GL_LIBNAME="libGL.so.1"
	      ])

        AC_DEFINE([HAVE_COGL_GL], [1], [Have GL for rendering])

        COGL_DEFINES_SYMBOLS="$COGL_DEFINES_SYMBOLS COGL_HAS_GL"
        COGL_DEFINES_SYMBOLS="$COGL_DEFINES_SYMBOLS CLUTTER_COGL_HAS_GL"
        HAVE_GL=1
      ])

AM_CONDITIONAL([COGL_DRIVER_GL_SUPPORTED], [test "x$enable_gl" = "xyes"])
AM_CONDITIONAL([COGL_DRIVER_GLES_SUPPORTED],
               [test "x$enable_gles1" = "xyes" || test "x$enable_gles2" = "xyes"])

dnl Allow the GL library names and default driver to be overridden with configure options
AC_ARG_WITH([gl-libname],
            [AS_HELP_STRING([--with-gl-libname],
                            override the name of the GL library to dlopen)],
            [COGL_GL_LIBNAME="$withval"])
AC_ARG_WITH([gles1-libname],
            [AS_HELP_STRING([--with-gles1-libname],
                            override the name of the GLESv1 library to dlopen)],
            [COGL_GLES1_LIBNAME="$withval"])
AC_ARG_WITH([gles2-libname],
            [AS_HELP_STRING([--with-gles2-libname],
                            override the name of the GLESv2 library to dlopen)],
            [COGL_GLES2_LIBNAME="$withval"])
AC_ARG_WITH([default-driver],
            [AS_HELP_STRING([--with-default-driver],
                            specify a default cogl driver)],
            [COGL_DEFAULT_DRIVER="${withval}"],
            [COGL_DEFAULT_DRIVER="" ])

AM_CONDITIONAL(HAVE_COGL_DEFAULT_DRIVER,
  [ test "x$COGL_DEFAULT_DRIVER" != "x" ])


AC_SUBST([COGL_GL_LIBNAME])
AC_SUBST([HAVE_GL])
AC_SUBST([COGL_GLES1_LIBNAME])
AC_SUBST([HAVE_GLES1])
AC_SUBST([COGL_GLES2_LIBNAME])
AC_SUBST([HAVE_GLES2])
AC_SUBST([COGL_DEFAULT_DRIVER])

if test "x$GL_LIBRARY_DIRECTLY_LINKED" = "xyes"; then
   AC_DEFINE([HAVE_DIRECTLY_LINKED_GL_LIBRARY], [1],
             [Defined if the GL library should not be dlopened])
fi

AC_ARG_ENABLE(
  [cogl-gles2],
  [AC_HELP_STRING([--enable-cogl-gles2=@<:@no/yes@:>@],
                  [Enable libcogl-gles2 frontend api for OpenGL-ES 2.0 @<:@default=auto@:>@])],
  [],
  [
    AS_IF([test "x$HAVE_GLES2" = "x1"],
          [enable_cogl_gles2=yes],
          [enable_cogl_gles2=no])
  ]
)
AS_IF([test "x$enable_cogl_gles2" = "xyes"],
      [
        AS_IF([test "x$HAVE_GLES2" != "x1"],
              [
                AC_MSG_ERROR([libcogl-gles2 is currently only supported on systems with a native GLES 2.0 library])
              ])
      ])
AM_CONDITIONAL([BUILD_COGL_GLES2], [test "x$enable_cogl_gles2" = "xyes"])


dnl         ========================================================
dnl         Check window system integration libraries...
dnl         ========================================================

AC_ARG_ENABLE(
  [glx],
  [AC_HELP_STRING([--enable-glx=@<:@no/yes@:>@], [Enable support GLX @<:@default=auto@:>@])],
  [],
  [AS_IF([test "x$ALLOW_GLX" = "xyes"], [enable_glx=yes], [enable_glx=no])]
)
AS_IF([test "x$enable_glx" = "xyes"],
      [
        AS_IF([test "x$ALLOW_GLX" != "xyes"],
              [AC_MSG_ERROR([GLX not supported with this configuration])])

        NEED_XLIB=yes
        SUPPORT_GLX=yes
        GL_WINSYS_APIS="$GL_WINSYS_APIS glx"

        COGL_DEFINES_SYMBOLS="$COGL_DEFINES_SYMBOLS COGL_HAS_GLX_SUPPORT"
      ])
AM_CONDITIONAL(SUPPORT_GLX, [test "x$SUPPORT_GLX" = "xyes"])

AC_ARG_ENABLE(
  [wgl],
  [AC_HELP_STRING([--enable-wgl=@<:@no/yes@:>@], [Enable support for WGL @<:@default=auto@:>@])],
  [],
  [AS_IF([test "x$ALLOW_WGL" = "xyes"], [enable_wgl=yes], [enable_wgl=no])]
)
AS_IF([test "x$enable_wgl" = "xyes"],
      [
        AS_IF([test "x$ALLOW_WGL" != "xyes"],
              [AC_MSG_ERROR([WGL not supported with this configuration])])

        SUPPORT_WGL=yes
        GL_WINSYS_APIS="$GL_WINSYS_APIS wgl"

        AC_DEFINE([COGL_HAS_WGL_SUPPORT], [1], [Cogl supports OpenGL using the WGL API])
        COGL_DEFINES_SYMBOLS="$COGL_DEFINES_SYMBOLS COGL_HAS_WIN32_SUPPORT"
      ])
AM_CONDITIONAL(SUPPORT_WGL, [test "x$SUPPORT_WGL" = "xyes"])

AC_ARG_ENABLE(
  [sdl],
  [AC_HELP_STRING([--enable-sdl=@<:@no/yes@:>@], [Enable support SDL @<:@default=no@:>@])],
  [],
  [enable_sdl=no])
AS_IF([test "x$enable_sdl" = "xyes"],
      [
        PKG_CHECK_MODULES([SDL],
                          [sdl],
                          [],
                          [AC_MSG_ERROR([SDL support requested but SDL not found])])

        SUPPORT_SDL=yes
        GL_WINSYS_APIS="$GL_WINSYS_APIS sdl"
        COGL_PKG_REQUIRES="$COGL_PKG_REQUIRES sdl"

        COGL_DEFINES_SYMBOLS="$COGL_DEFINES_SYMBOLS COGL_HAS_SDL_SUPPORT"

        dnl WebOS has a specially patched version of SDL to add
        dnl support for creating a GLES1/2 context. This tries to
        dnl detect that patch so we can use it if the GLES2 driver is
        dnl selected.
        cogl_save_CPPFLAGS="$CPPFLAGS"
        CPPFLAGS="$CPPFLAGS $SDL_CFLAGS"
        AC_CHECK_DECL([SDL_OPENGLES],
                      [SUPPORT_SDL_GLES=yes],
                      [SUPPORT_SDL_GLES=no],
                      [#include <SDL.h>])
        AC_CHECK_DECL([SDL_GL_CONTEXT_MAJOR_VERSION], [], [SUPPORT_SDL_GLES=no],
                      [#include <SDL.h>])
        AC_CHECK_DECL([SDL_GL_CONTEXT_MINOR_VERSION], [], [SUPPORT_SDL_GLES=no],
                      [#include <SDL.h>])
        CPPFLAGS="$cogl_save_CPPFLAGS"

        AS_IF([test "x$SUPPORT_SDL_GLES" = "xyes"],
              COGL_DEFINES_SYMBOLS="$COGL_DEFINES_SYMBOLS COGL_HAS_SDL_GLES_SUPPORT")
      ],
      [SUPPORT_SDL=no])
AM_CONDITIONAL(SUPPORT_SDL, [test "x$SUPPORT_SDL" = "xyes"])

AC_ARG_ENABLE(
  [sdl2],
  [AC_HELP_STRING([--enable-sdl2=@<:@no/yes@:>@], [Enable SDL2 support @<:@default=no@:>@])],
  [],
  [enable_sdl2=no])
AS_IF([test "x$enable_sdl2" = "xyes"],
      [
        PKG_CHECK_MODULES([SDL2],
                          [sdl2],
                          [],
                          [AC_MSG_ERROR([SDL2 support requested but SDL2 not found])])

        SUPPORT_SDL2=yes
        GL_WINSYS_APIS="$GL_WINSYS_APIS sdl2"
        COGL_PKG_REQUIRES="$COGL_PKG_REQUIRES sdl2"

        COGL_DEFINES_SYMBOLS="$COGL_DEFINES_SYMBOLS COGL_HAS_SDL_SUPPORT"
      ],
      [SUPPORT_SDL2=no])
AM_CONDITIONAL(SUPPORT_SDL2, [test "x$SUPPORT_SDL2" = "xyes"])

AS_IF([test "x$SUPPORT_SDL2" = "xyes" -a "x$SUPPORT_SDL" = "xyes"],
      [AC_MSG_ERROR([The SDL1 and SDL2 winsyses are currently mutually exclusive])])

EGL_PLATFORM_COUNT=0

AC_ARG_ENABLE(
  [null-egl-platform],
  [AC_HELP_STRING([--enable-null-egl-platform=@<:@no/yes@:>@], [Enable support for the NULL egl platform @<:@default=no@:>@])],
  [],
  enable_null_egl_platform=no
)
AS_IF([test "x$enable_null_egl_platform" = "xyes"],
      [
        EGL_PLATFORM_COUNT=$((EGL_PLATFORM_COUNT+1))
        NEED_EGL=yes
        EGL_PLATFORMS="$EGL_PLATFORMS null"

        COGL_DEFINES_SYMBOLS="$COGL_DEFINES_SYMBOLS COGL_HAS_EGL_PLATFORM_POWERVR_NULL_SUPPORT"
      ])
AM_CONDITIONAL(SUPPORT_EGL_PLATFORM_POWERVR_NULL,
               [test "x$enable_null_egl_platform" = "xyes"])

AC_ARG_ENABLE(
  [gdl-egl-platform],
  [AC_HELP_STRING([--enable-gdl-egl-platform=@<:@no/yes@:>@], [Enable support for the GDL egl platform @<:@default=no@:>@])],
  [],
  enable_gdl_egl_platform=no
)
AS_IF([test "x$enable_gdl_egl_platform" = "xyes"],
      [
        EGL_PLATFORM_COUNT=$((EGL_PLATFORM_COUNT+1))
        NEED_EGL=yes
        EGL_PLATFORMS="$EGL_PLATFORMS gdl"

        AC_CHECK_HEADERS(
          [libgdl.h],
          [],
          [
            AC_CHECK_HEADERS(
              [CE4100/libgdl.h],
              [
               COGL_EXTRA_CFLAGS="$COGL_EXTRA_CFLAGS -I/usr/include/CE4100"
              ],
              [AC_MSG_ERROR([libgdl.h not found])])
          ])

        COGL_EXTRA_LDFLAGS="$COGL_EXTRA_LDFLAGS -lgdl"

        COGL_DEFINES_SYMBOLS="$COGL_DEFINES_SYMBOLS COGL_HAS_EGL_PLATFORM_GDL_SUPPORT"
      ])
AM_CONDITIONAL(SUPPORT_EGL_PLATFORM_GDL,
               [test "x$enable_gdl_egl_platform" = "xyes"])

AC_ARG_ENABLE(
  [wayland-egl-platform],
  [AC_HELP_STRING([--enable-wayland-egl-platform=@<:@no/yes@:>@], [Enable support for the Wayland egl platform @<:@default=no@:>@])],
  [],
  enable_wayland_egl_platform=no
)
AS_IF([test "x$enable_wayland_egl_platform" = "xyes"],
      [
        EGL_PLATFORM_COUNT=$((EGL_PLATFORM_COUNT+1))
        NEED_EGL=yes
        EGL_PLATFORMS="$EGL_PLATFORMS wayland"

        PKG_CHECK_EXISTS([wayland-egl],
                         [
                           COGL_PKG_REQUIRES="$COGL_PKG_REQUIRES wayland-egl"
                           COGL_PKG_REQUIRES="$COGL_PKG_REQUIRES wayland-client"
                         ],
                         [AC_MSG_ERROR([Unable to locate required wayland libraries])])

        COGL_DEFINES_SYMBOLS="$COGL_DEFINES_SYMBOLS COGL_HAS_EGL_PLATFORM_WAYLAND_SUPPORT"
      ])
AM_CONDITIONAL(SUPPORT_EGL_PLATFORM_WAYLAND,
               [test "x$enable_wayland_egl_platform" = "xyes"])


AC_ARG_ENABLE(
  [kms-egl-platform],
  [AC_HELP_STRING([--enable-kms-egl-platform=@<:@no/yes@:>@], [Enable support for the KMS egl platform @<:@default=no@:>@])],
  [],
  enable_kms_egl_platform=no
)
AS_IF([test "x$enable_kms_egl_platform" = "xyes"],
      [
        EGL_PLATFORM_COUNT=$((EGL_PLATFORM_COUNT+1))
        NEED_EGL=yes
        EGL_PLATFORMS="$EGL_PLATFORMS kms"

        PKG_CHECK_EXISTS([gbm],
                         [
                           COGL_PKG_REQUIRES="$COGL_PKG_REQUIRES gbm"
                           COGL_PKG_REQUIRES="$COGL_PKG_REQUIRES libdrm"
                         ],
                         [AC_MSG_ERROR([Unable to locate required kms libraries])])

        GBM_VERSION=`$PKG_CONFIG --modversion gbm`
        GBM_MAJOR=`echo $GBM_VERSION | cut -d'.' -f1`
        GBM_MINOR=`echo $GBM_VERSION | cut -d'.' -f2`
        GBM_MICRO=`echo $GBM_VERSION | cut -d'.' -f3`

        AC_DEFINE_UNQUOTED([COGL_GBM_MAJOR], [$GBM_MAJOR], [The major version for libgbm])
        AC_DEFINE_UNQUOTED([COGL_GBM_MINOR], [$GBM_MINOR], [The minor version for libgbm])
        AC_DEFINE_UNQUOTED([COGL_GBM_MICRO], [$GBM_MICRO], [The micro version for libgbm])

        COGL_DEFINES_SYMBOLS="$COGL_DEFINES_SYMBOLS COGL_HAS_EGL_PLATFORM_KMS_SUPPORT"
      ])
AM_CONDITIONAL(SUPPORT_EGL_PLATFORM_KMS,
               [test "x$enable_kms_egl_platform" = "xyes"])

AC_ARG_ENABLE(
  [wayland-egl-server],
  [AC_HELP_STRING([--enable-wayland-egl-server=@<:@no/yes@:>@], [Enable server side wayland support @<:@default=no@:>@])],
  [],
  enable_wayland_egl_server=no
)
AS_IF([test "x$enable_wayland_egl_server" = "xyes"],
      [
        NEED_EGL=yes

        PKG_CHECK_EXISTS([wayland-server],
                         [
                           COGL_PKG_REQUIRES="$COGL_PKG_REQUIRES wayland-server"
                         ],
                         [AC_MSG_ERROR([Unable to locate required wayland-server library])])

        WAYLAND_SERVER_VERSION=`$PKG_CONFIG --modversion gbm`
        WAYLAND_SERVER_MAJOR=`echo $WAYLAND_SERVER_VERSION | cut -d'.' -f1`
        WAYLAND_SERVER_MINOR=`echo $WAYLAND_SERVER_VERSION | cut -d'.' -f2`
        WAYLAND_SERVER_MICRO=`echo $WAYLAND_SERVER_VERSION | cut -d'.' -f3`

        COGL_DEFINES_SYMBOLS="$COGL_DEFINES_SYMBOLS COGL_HAS_WAYLAND_EGL_SERVER_SUPPORT"
      ])
AM_CONDITIONAL(SUPPORT_WAYLAND_EGL_SERVER,
               [test "x$enable_wayland_egl_server" = "xyes"])
AM_CONDITIONAL(WAYLAND_0_85_X_SERVER,
               [test "x$WAYLAND_SERVER_MAJOR" = "x1" -a "x$WAYLAND_SERVER_MINOR" = "x85"])

dnl Android EGL platform
AC_ARG_ENABLE(
  [android-egl-platform],
  [AC_HELP_STRING([--enable-android-egl-platform=@<:@no/yes@:>@], [Enable support for the Android egl platform @<:@default=no@:>@])],
  [],
  enable_android_egl_platform=no
)
AS_IF([test "x$enable_android_egl_platform" = "xyes"],
      [
        EGL_PLATFORM_COUNT=$((EGL_PLATFORM_COUNT+1))
        NEED_EGL=yes
        EGL_PLATFORMS="$EGL_PLATFORMS android"

        AC_CHECK_HEADER([android/native_window.h],
                        [],
                        [AC_MSG_ERROR([Unable to locate android/native_window.h])])

        COGL_DEFINES_SYMBOLS="$COGL_DEFINES_SYMBOLS COGL_HAS_EGL_PLATFORM_ANDROID_SUPPORT"
      ])
AM_CONDITIONAL(SUPPORT_EGL_PLATFORM_ANDROID,
               [test "x$enable_android_egl_platform" = "xyes"])

dnl This should go last, since it's the default fallback and we need
dnl to check the value of $EGL_PLATFORM_COUNT here.
AC_ARG_ENABLE(
  [xlib-egl-platform],
  [AC_HELP_STRING([--enable-xlib-egl-platform=@<:@no/yes@:>@], [Enable support for the Xlib egl platform @<:@default=auto@:>@])],
  [],
  AS_IF([test "x$enable_gles1" = "xyes" -o "x$enable_gles2" = "xyes" && test "x$SUPPORT_SDL_GLES" != "xyes" && test "x$SUPPORT_SDL2" != "xyes" && test $EGL_PLATFORM_COUNT -eq 0],
        [enable_xlib_egl_platform=yes], [enable_xlib_egl_platform=no])
)
AS_IF([test "x$enable_xlib_egl_platform" = "xyes"],
      [
        EGL_PLATFORM_COUNT=$((EGL_PLATFORM_COUNT+1))
        NEED_EGL=yes
        NEED_XLIB=yes
        EGL_PLATFORMS="$EGL_PLATFORMS xlib"

        COGL_DEFINES_SYMBOLS="$COGL_DEFINES_SYMBOLS COGL_HAS_EGL_PLATFORM_XLIB_SUPPORT"
      ])
AM_CONDITIONAL(SUPPORT_EGL_PLATFORM_XLIB,
               [test "x$enable_xlib_egl_platform" = "xyes"])

AS_IF([test "x$NEED_EGL" = "xyes" && test "x$EGL_CHECKED" != "xyes"],
      [
        PKG_CHECK_EXISTS([egl],
          [COGL_PKG_REQUIRES="$COGL_PKG_REQUIRES egl"],
          [
            AC_CHECK_HEADERS(
              [EGL/egl.h],
              [],
              [AC_MSG_ERROR([Unable to locate required EGL headers])])
            AC_CHECK_HEADERS(
              [EGL/eglext.h],
              [],
              [AC_MSG_ERROR([Unable to locate required EGL headers])],
              [#include <EGL/egl.h>])

            AC_CHECK_LIB(EGL, [eglInitialize],
              [COGL_EXTRA_LDFLAGS="$COGL_EXTRA_LDFLAGS -lEGL"],
              [AC_MSG_ERROR([Unable to locate required EGL library])])

            COGL_EXTRA_LDFLAGS="$COGL_EXTRA_LDFLAGS -lEGL"
          ]
          )

        COGL_EGL_INCLUDES="#include <EGL/egl.h>
#include <EGL/eglext.h>"
        AC_SUBST([COGL_EGL_INCLUDES])
      ])

AS_IF([test "x$NEED_EGL" = "xyes"],
      [
        SUPPORT_EGL=yes
        GL_WINSYS_APIS="$GL_WINSYS_APIS egl"
        COGL_DEFINES_SYMBOLS="$COGL_DEFINES_SYMBOLS COGL_HAS_EGL_SUPPORT"
      ])

AM_CONDITIONAL(SUPPORT_EGL, [test "x$SUPPORT_EGL" = "xyes"])

dnl         ========================================================
dnl         Check X11 dependencies if required
dnl         ========================================================
AS_IF([test "x$NEED_XLIB" = "xyes"],
      [
        X11_MODULES="x11 xext xfixes >= xfixes_req_version xdamage xcomposite >= xcomposite_req_version"
        PKG_CHECK_MODULES(DUMMY, [$X11_MODULES],
                          [COGL_PKG_REQUIRES="$COGL_PKG_REQUIRES $X11_MODULES"])
        SUPPORT_X11=yes
        SUPPORT_XLIB=yes

        COGL_DEFINES_SYMBOLS="$COGL_DEFINES_SYMBOLS COGL_HAS_X11"
        COGL_DEFINES_SYMBOLS="$COGL_DEFINES_SYMBOLS COGL_HAS_X11_SUPPORT"
        COGL_DEFINES_SYMBOLS="$COGL_DEFINES_SYMBOLS COGL_HAS_XLIB"
        COGL_DEFINES_SYMBOLS="$COGL_DEFINES_SYMBOLS COGL_HAS_XLIB_SUPPORT"
      ])

AM_CONDITIONAL(X11_TESTS, [test "x$SUPPORT_X11" = "xyes"])
AM_CONDITIONAL(SUPPORT_X11, [test "x$SUPPORT_X11" = "xyes"])
AM_CONDITIONAL(SUPPORT_XLIB, [test "x$SUPPORT_XLIB" = "xyes"])

dnl ================================================================
dnl Documentation stuff.
dnl ================================================================
# gtkdocize greps for ^GTK_DOC_CHECK and parses it, so you need to have
# it on it's own line.
m4_ifdef([GTK_DOC_CHECK], [
GTK_DOC_CHECK([gtk_doc_req_version], [--flavour no-tmpl])
])
AM_CONDITIONAL([BUILD_GTK_DOC], [test "x$enable_gtk_doc" = "xyes"])

dnl ================================================================
dnl I18n stuff.
dnl ================================================================
AM_GNU_GETTEXT_VERSION([0.17])
AM_GNU_GETTEXT([external])

GETTEXT_PACKAGE="cogl"
AC_SUBST(GETTEXT_PACKAGE)
AC_DEFINE_UNQUOTED(GETTEXT_PACKAGE,
                   "$GETTEXT_PACKAGE",
                   [The prefix for our gettext translation domains.])
AS_ALL_LINGUAS


AC_SUBST(COGL_PKG_REQUIRES)
PKG_CHECK_MODULES(COGL_DEP, [$COGL_PKG_REQUIRES])
if test -n "$COGL_PKG_REQUIRES_GL"; then
  PKG_CHECK_MODULES(COGL_DEP_GL, [$COGL_PKG_REQUIRES_GL])

  dnl Strip out the GL libraries from the GL pkg-config files so we can
  dnl dynamically load them instead
  gl_libs=""
  for x in $COGL_DEP_GL_LIBS; do
    AS_CASE([$x],
            [-lGL], [],
            [-lGLESv2], [],
            [-lGLESv1_CM], [],
            [*], [gl_libs="$gl_libs $x"])
  done
  COGL_DEP_CFLAGS="$COGL_DEP_CFLAGS $COGL_DEP_CFLAGS_GL"
  COGL_DEP_LIBS="$COGL_DEP_LIBS $gl_libs"
fi
AC_SUBST(COGL_PANGO_PKG_REQUIRES)

AS_IF([test "x$enable_cogl_pango" = "xyes"],
  [PKG_CHECK_MODULES(COGL_PANGO_DEP, [$COGL_PANGO_PKG_REQUIRES])]
)
AM_CONDITIONAL([BUILD_COGL_PANGO], [test "x$enable_cogl_pango" = "xyes"])


dnl ================================================================
dnl Misc program dependencies.
dnl ================================================================
AC_PROG_INSTALL

dnl ================================================================
dnl GObject-Introspection check
dnl ================================================================
AS_IF([test "x$enable_glib" = "xyes"],
  [
    GOBJECT_INTROSPECTION_CHECK([gi_req_version])
  ],
  [
    enable_introspection="no"
    AM_CONDITIONAL([HAVE_INTROSPECTION], 0)
  ]
)

dnl ================================================================
dnl Checks for header files.
dnl ================================================================
AC_PATH_X
AC_HEADER_STDC
AC_CHECK_HEADERS(fcntl.h limits.h unistd.h)


dnl ================================================================
dnl Checks for library functions.
dnl ================================================================

dnl The 'ffs' function is part of C99 so it isn't always
dnl available. Cogl has a fallback if needed.
AC_CHECK_FUNCS([ffs])

dnl 'memmem' is a GNU extension but we have a simple fallback
AC_CHECK_FUNCS([memmem])

dnl ================================================================
dnl Platform values
dnl ================================================================

dnl These are values from system headers that we want to copy into the
dnl public Cogl headers without having to include the system header
AC_CHECK_HEADER(poll.h,
        [
         AC_COMPUTE_INT(COGL_SYSDEF_POLLIN, POLLIN, [#include <poll.h>],
                        AC_MSG_ERROR([Unable to get value of POLLIN]))
         AC_COMPUTE_INT(COGL_SYSDEF_POLLPRI, POLLPRI, [#include <poll.h>],
                        AC_MSG_ERROR([Unable to get value of POLLPRI]))
         AC_COMPUTE_INT(COGL_SYSDEF_POLLOUT, POLLOUT, [#include <poll.h>],
                        AC_MSG_ERROR([Unable to get value of POLLOUT]))
         AC_COMPUTE_INT(COGL_SYSDEF_POLLERR, POLLERR, [#include <poll.h>],
                        AC_MSG_ERROR([Unable to get value of POLLERR]))
         AC_COMPUTE_INT(COGL_SYSDEF_POLLHUP, POLLHUP, [#include <poll.h>],
                        AC_MSG_ERROR([Unable to get value of POLLHUP]))
         AC_COMPUTE_INT(COGL_SYSDEF_POLLNVAL, POLLNVAL, [#include <poll.h>],
                        AC_MSG_ERROR([Unable to get value of POLLNVAL]))
        ],
        [
         COGL_SYSDEF_POLLIN=1
         COGL_SYSDEF_POLLPRI=2
         COGL_SYSDEF_POLLOUT=4
         COGL_SYSDEF_POLLERR=8
         COGL_SYSDEF_POLLHUP=16
         COGL_SYSDEF_POLLNVAL=32
        ])
COGL_DEFINES_EXTRA="$COGL_DEFINES_EXTRA
#define COGL_SYSDEF_POLLIN $COGL_SYSDEF_POLLIN
#define COGL_SYSDEF_POLLPRI $COGL_SYSDEF_POLLPRI
#define COGL_SYSDEF_POLLOUT $COGL_SYSDEF_POLLOUT
#define COGL_SYSDEF_POLLERR $COGL_SYSDEF_POLLERR
#define COGL_SYSDEF_POLLHUP $COGL_SYSDEF_POLLHUP
#define COGL_SYSDEF_POLLNVAL $COGL_SYSDEF_POLLNVAL
"

dnl ================================================================
dnl What needs to be substituted in other files
dnl ================================================================
COGL_DEFINES="$COGL_DEFINES_EXTRA"
for x in $COGL_DEFINES_SYMBOLS; do
  COGL_DEFINES="$COGL_DEFINES
#define $x 1"
done;
AC_SUBST(COGL_DEFINES)
AM_SUBST_NOTMAKE(COGL_DEFINES)

AS_IF([test "x$cogl_gl_headers" = "x"],
      [AC_MSG_ERROR([Internal error: no GL header set])])
dnl cogl_gl_headers is a space separate list of headers to
dnl include. We'll now convert them to a single variable with a
dnl #include line for each header
COGL_GL_HEADER_INCLUDES=""
for x in $cogl_gl_headers; do
  COGL_GL_HEADER_INCLUDES="$COGL_GL_HEADER_INCLUDES
#include <$x>"
done;
AC_SUBST(COGL_GL_HEADER_INCLUDES)
AM_SUBST_NOTMAKE(COGL_GL_HEADER_INCLUDES)

AC_DEFINE([COGL_ENABLE_EXPERIMENTAL_2_0_API], [1],
          [Can use Cogl 2.0 API internally])
AC_DEFINE([COGL_ENABLE_EXPERIMENTAL_API], [1],
          [Can use experimental API internally])

AC_SUBST(COGL_DEP_CFLAGS)
AC_SUBST(COGL_DEP_LIBS)
AC_SUBST(COGL_PANGO_DEP_CFLAGS)
AC_SUBST(COGL_PANGO_DEP_LIBS)
AC_SUBST(COGL_EXTRA_CFLAGS)
AC_SUBST(COGL_EXTRA_LDFLAGS)

# just for compatability with the clutter build...
MAINTAINER_CFLAGS=
AC_SUBST(MAINTAINER_CFLAGS)

AC_OUTPUT(
Makefile
README
config.h.win32
build/Makefile
build/win32/Makefile
build/win32/vs9/Makefile
build/win32/vs10/Makefile
deps/Makefile
deps/glib/Makefile
deps/gmodule/Makefile
deps/gmodule/gmoduleconf.h
cogl/Makefile
cogl/cogl-1.0.pc
cogl/cogl-2.0-experimental.pc
cogl/cogl-defines.h
cogl/cogl-defines.h.win32
cogl/cogl-defines.h.win32_SDL
cogl/cogl-gl-header.h
cogl/cogl-egl-defines.h
cogl/cogl.rc
cogl-pango/Makefile
cogl-pango/cogl-pango-1.0.pc
cogl-pango/cogl-pango-2.0-experimental.pc
cogl-pango/cogl-pango.rc
cogl-gles2/Makefile
cogl-gles2/cogl-gles2-experimental.pc
doc/Makefile
doc/reference/Makefile
doc/reference/cogl/Makefile
doc/reference/cogl/cogl-docs.xml
doc/reference/cogl-2.0-experimental/Makefile
doc/reference/cogl-2.0-experimental/cogl-2.0-experimental-docs.xml
examples/Makefile
tests/Makefile
tests/conform/Makefile
tests/conform/config.env
tests/conform/test-launcher.sh
tests/micro-perf/Makefile
tests/data/Makefile
po/Makefile.in
)

dnl ================================================================
dnl Dah Da!
dnl ================================================================
echo ""
echo "Cogl - $COGL_1_VERSION/$COGL_VERSION (${COGL_RELEASE_STATUS})"

# Global flags
echo ""
echo " • Global:"
echo "        Prefix: ${prefix}"
if test "x$COGL_DEFAULT_DRIVER" != "x"; then
echo "        Default driver: ${COGL_DEFAULT_DRIVER}"
fi

echo ""
# Features
echo " • Features:"
echo "        Drivers: ${enabled_drivers}"
AS_IF([test "x$GL_LIBRARY_DIRECTLY_LINKED" != xyes],
      [for driver in $enabled_drivers; do
         driver=`echo $driver | tr "[gles]" "[GLES]"`
         libname=`eval echo \\$COGL_${driver}_LIBNAME`
         echo "        Library name for $driver: $libname"
       done])
echo "        GL Window System APIs:${GL_WINSYS_APIS}"
if test "x$SUPPORT_EGL" = "xyes"; then
echo "        EGL Platforms:${EGL_PLATFORMS}"
echo "        Wayland compositor support: ${enable_wayland_egl_server}"
fi
if test "x$SUPPORT_SDL" = "xyes"; then
echo "        Support GLES under SDL: ${SUPPORT_SDL_GLES}"
fi
echo "        Build libcogl-gles2 GLES 2.0 frontend api: ${enable_cogl_gles2}"
echo "        Image backend: ${COGL_IMAGE_BACKEND}"
echo "        Cogl Pango: ${enable_cogl_pango}"
echo "        Profiling: ${enable_profile}"

# Compiler/Debug related flags
echo ""
echo " • Compiler options:"
echo "        Cogl debug: ${enable_debug}"
echo "        Enable deprecated symbols: ${enable_deprecated}"
echo "        Compiler flags: ${CFLAGS} ${COGL_EXTRA_CFLAGS}"
echo "        Linker flags: ${LDFLAGS} ${COGL_EXTRA_LDFLAGS}"

# Miscellaneous
echo ""
echo " • Extra:"
echo "        Build API reference: ${enable_gtk_doc}"
echo "        Build introspection data: ${enable_introspection}"
echo "        Enable internationalization: ${USE_NLS}"

echo ""

# General warning about experimental features
if test "x$EXPERIMENTAL_CONFIG" = "xyes"; then
echo ""
echo "☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠"
echo " *WARNING*"
echo ""
echo "  The stability of your build might be affected by one or more"
echo "  experimental configuration options."
echo
echo "  experimental options: $EXPERIMENTAL_OPTIONS"
echo "☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠"
echo ""
fi
