mutter/configure.ac

# clutter package version number, (as distinct from shared library version)
# An odd micro number indicates in-progress development, (eg. from CVS)
# An even micro number indicates a released version.
m4_define([clutter_major_version], [0])
m4_define([clutter_minor_version], [7])
m4_define([clutter_micro_version], [1])

m4_define([clutter_version],
          [clutter_major_version.clutter_minor_version.clutter_micro_version])

m4_define([clutter_api_version],
          [clutter_major_version.clutter_minor_version])

# increase the interface age for each release; if the API changes, set to 0
m4_define([clutter_interface_age], [0])
m4_define([clutter_binary_age],
          [m4_eval(100 * clutter_minor_version + clutter_micro_version)])

AC_PREREQ(2.53)

AC_INIT([clutter],
        [clutter_version],
        [http://bugzilla.o-hand.com/enter_bug.cgi?product=Clutter])
AC_CONFIG_SRCDIR([clutter/clutter.h])
AM_CONFIG_HEADER([config.h])

AM_INIT_AUTOMAKE([1.9])

CLUTTER_MAJOR_VERSION=clutter_major_version
CLUTTER_MINOR_VERSION=clutter_minor_version
CLUTTER_MICRO_VERSION=clutter_micro_version
CLUTTER_VERSION=clutter_version
CLUTTER_API_VERSION=clutter_api_version
CLUTTER_MAJORMINOR=clutter_api_version
AC_SUBST(CLUTTER_MAJOR_VERSION)
AC_SUBST(CLUTTER_MINOR_VERSION)
AC_SUBST(CLUTTER_MICRO_VERSION)
AC_SUBST(CLUTTER_VERSION)
AC_SUBST(CLUTTER_API_VERSION)
AC_SUBST(CLUTTER_MAJORMINOR)

m4_define([lt_current],
          [m4_eval(100 * clutter_minor_version + clutter_micro_version - clutter_interface_age)])
m4_define([lt_revision], [clutter_interface_age])
m4_define([lt_age], [m4_eval(clutter_binary_age - clutter_interface_age)])
CLUTTER_LT_CURRENT=lt_current
CLUTTER_LT_REV=lt_revision
CLUTTER_LT_AGE=lt_age
CLUTTER_LT_VERSION="$CLUTTER_LT_CURRENT:$CLUTTER_LT_REV:$CLUTTER_LT_AGE"
CLUTTER_LT_LDFLAGS="-version-info $CLUTTER_LT_VERSION"

AC_SUBST(CLUTTER_LT_VERSION)
AC_SUBST(CLUTTER_LT_LDFLAGS)

dnl ========================================================================

# Checks for programs.
AC_PROG_CC
#_AM_DEPENDENCIES([OBJC]) 
#AC_PROG_OBJC            
AC_DISABLE_STATIC
AC_PROG_LIBTOOL

# Make libtool respect the make -s switch (kudos to jacob berman)
changequote(,)dnl
LIBTOOL="${LIBTOOL} \$(shell echo \"\$(MFLAGS)\" | awk '/^[^ ]*s/ { print \"--silent\" }')"
changequote([,])dnl

# Checks for header files.
AC_HEADER_STDC
AC_CHECK_HEADERS([fcntl.h stdlib.h string.h unistd.h])

# Checks for typedefs, structures, and compiler characteristics.
AC_C_CONST

# Checks for library functions.
AC_FUNC_MALLOC
AC_FUNC_MMAP
AC_CHECK_FUNCS([memset munmap strcasecmp strdup])

dnl ========================================================================

imagebackend="gdk-pixbuf"
AC_ARG_WITH([imagebackend],
            AC_HELP_STRING([--with-imagebackend=@<:@gdk-pixbuf/internal@:>@],
                           [Select COGL image loading backend]),
            imagebackend=$with_imagebackend)

case $imagebackend in

  gdk-pixbuf)
    AC_DEFINE([USE_GDKPIXBUF], 1, [Use GdkPixbuf for loading image files])
    ;;

  internal)
    ;;


esac


dnl ========================================================================

backendextra=
backendextralib=
glesversion=1.1
clutterbackend=glx
AC_ARG_WITH([flavour],
            AC_HELP_STRING([--with-flavour=@<:@glx/eglx/eglnative/sdl/osx@:>@],
                           [Select the Clutter backend]),
            clutterbackend=$with_flavour)


AC_ARG_WITH([gles],
            AC_HELP_STRING([--with-gles=@1.1/2.0@:>@],
                           [Select Clutter GLES version (for EGL backends)]),
            glesversion=$with_gles)

BACKEND_PC_FILES=""

# Check for X though could be redundant if backend does not need it.
PKG_CHECK_MODULES(X11, x11, [have_x11=yes], [have_x11=no])
if test x$have_x11 = xno; then
     AC_PATH_X
     if test x"$no_x" = "yes" ; then
        if test "x$clutterbackend" = "xglx" or "x$clutterbackend" = "xeglx"
        then
	   AC_MSG_ERROR([[No X11 Libraries found and required by backend.]])
	fi
     fi
     if test x"$x_includes" != x"NONE" && test -n "$x_includes" ; then
	X11_CFLAGS=-I`echo $x_includes | sed -e "s/:/ -I/g"`
     fi
     if test x"$x_libraries" != x"NONE" && test -n "$x_libraries" ; then
	X11_LIBS=-L`echo $x_libraries | sed -e "s/:/ -L/g"`
     fi
fi

PKG_CHECK_MODULES(XFIXES, xfixes >= 4, [have_xfixes=yes], [have_xfixes=no])
if test x$have_xfixes = xyes; then
      AC_DEFINE(HAVE_XFIXES, 1, [Have the XFIXES X extension])
      X11_LIBS="$X11_LIBS -lXfixes"
fi

PKG_CHECK_MODULES(XDAMAGE, xdamage, [have_xdamage=yes], [have_xdamage=no])
if test x$have_xdamage = xyes; then
      AC_DEFINE(HAVE_XDAMAGE, 1, [Have the XDAMAGE X extension])
      X11_LIBS="$X11_LIBS -lXdamage"
fi

# FIXME: Composite 0.3/0.4 likely needed when window redirection complete.
#        though may not be needed at all
PKG_CHECK_MODULES(XCOMPOSITE, xcomposite, [have_xcomposite=yes], [have_xcomposite=no])
if test x$have_xcomposite = xyes; then
      AC_DEFINE(HAVE_XCOMPOSITE, 1, [Have the XCOMPOSITE X extension])
      X11_LIBS="$X11_LIBS -lXcomposite"
fi

x11_tests=no

# Currently require all extentions, may not for actual release.
if test "x$clutterbackend" = "xglx" || test "x$clutterbackend" = "xeglx" 
then
      if test "x$have_xdamage" = "xno" || test "x$have_xfixes" = "xno" || test "x$have_xcomposite" = "xno" 
      then
            AC_MSG_ERROR([[Required backend X11 Libraries not found.]])
      fi
      x11_tests=yes
fi

AM_CONDITIONAL(X11_TESTS, test "x$x11_tests" != "xno")

clutter_gl_header=""

if test "x$clutterbackend" = "xeglnative" || test "x$clutterbackend" = "xeglx" || test "x$clutterbackend" = "xfruity" 
then
case $glesversion in

  1*)
    clutter_gl_header="GLES/gl.h"
    CLUTTER_COGL="gles"
    AC_DEFINE([HAVE_COGL_GLES], 1, [Have GL/ES for rendering])

    AC_CHECK_HEADERS([GLES/egl.h],,
	         [AC_MSG_ERROR([Unable to locate required GLES headers])])
    AC_CHECK_HEADERS([$clutter_gl_header],,
	         [AC_MSG_ERROR([Unable to locate required GLES headers])])


    # check for upper/lower case libgles_em
    # The powervr sdk uses lower case.
    AC_CHECK_LIB(GLES_CM, eglInitialize, HAVE_LIBGLES=yes, HAVE_LIBGLES=no)
    if test "x$HAVE_LIBGLES" = "xno"; then

        AC_CHECK_LIB(gles_cm, eglInitialize, HAVE_LIBGLES=yes, HAVE_LIBGLES=no)
	if test "x$HAVE_LIBGLES" = "xno"; then
	  AC_MSG_ERROR([GLES library not found and egl backend requested.]);
	fi
        GLES_LIBS="-lgles_cm"

   else
        GLES_LIBS="-lGLES_CM"
   fi
  ;;
  2*)
    clutter_gl_header="GLES2/gl2.h"
    CLUTTER_COGL="gl"
    AC_DEFINE([HAVE_COGL_GLES2], 1, [Have GL/ES for rendering])

    AC_CHECK_HEADERS([EGL/egl.h],,
	         [AC_MSG_ERROR([Unable to locate required GLES headers])])

    AC_CHECK_HEADERS([$clutter_gl_header],,
	         [AC_MSG_ERROR([Unable to locate required GLES headers])])

    GLES_LIBS="-lGLESv2 -lEGL"
  ;;

  *) AC_MSG_ERROR([Invalid GL ES Version '$glesversion' specified])
    ;;

esac
fi

case $clutterbackend in

  sdl)

    clutter_gl_header="GL/gl.h"
    CLUTTER_FLAVOUR="sdl"
    CLUTTER_STAGE_TYPE="CLUTTER_TYPE_STAGE_SDL"
    AC_DEFINE([HAVE_CLUTTER_SDL], 1, [Have the SDL backend])

    CLUTTER_COGL="gl"
    AC_DEFINE([HAVE_COGL_GL], 1, [Have GL for rendering])

    AC_PATH_PROG(SDL_CONFIG, sdl-config)
    if test "x$SDL_CONFIG" = "x"; then
       AC_MSG_ERROR([[No sdl-config binary found in path and SDL flavour requested.]])
    else
       SDL_CFLAGS=`$SDL_CONFIG --cflags`
       SDL_LIBS=`$SDL_CONFIG --libs`

       AC_CHECK_HEADERS([$clutter_gl_header],,
                        [AC_MSG_ERROR([Unable to locate required GL headers])])

       dnl Use GLee under Windows instead of GL
       case "$host" in
         *mingw32*)
           AC_CHECK_LIB(GLee, GLeeInit, HAVE_LIBGLEE=yes, HAVE_LIBGLEE=no, -lopengl32)
	   if test "x$HAVE_LIBGLEE" = "xno"; then
	     AC_MSG_ERROR([libGLee not found]);
	   fi

           SDL_LIBS="$SDL_LIBS -lGLee -lopengl32"
	   CLUTTER_LT_LDFLAGS="$CLUTTER_LT_LDFLAGS -no-undefined"
           ;;
         *)
	   AC_CHECK_LIB(GL, glEnable, HAVE_LIBGL=yes, HAVE_LIBGL=no)
	   if test "x$HAVE_LIBGL" = "xno"; then
	     AC_MSG_ERROR([libGL not found]);
	   fi
           SDL_LIBS="$SDL_LIBS -lGL"
           ;;
       esac
    fi
    ;;

  glx)

    clutter_gl_header="GL/gl.h"
    CLUTTER_FLAVOUR="glx"
    CLUTTER_STAGE_TYPE="CLUTTER_TYPE_STAGE_GLX"
    AC_DEFINE([HAVE_CLUTTER_GLX], 1, [Have the GLX backend])

    CLUTTER_COGL="gl"
    AC_DEFINE([HAVE_COGL_GL], 1, [Have GL for rendering])

    AC_CHECK_HEADERS([$clutter_gl_header],,
                     [AC_MSG_ERROR([Unable to locate required GL headers])])
    AC_CHECK_HEADERS([GL/glx.h],,
                     [AC_MSG_ERROR([Unable to locate required GLX headers])])

    AC_CHECK_LIB(GL, glXCreateContext, HAVE_LIBGLX=yes, HAVE_LIBGLX=no)

    if test "x$HAVE_LIBGLX" = "xno"; then
      AC_MSG_ERROR([GLX not found and GLX backend requested]);
    fi

    if test "x$imagebackend" = "xgdk-pixbuf"; then
        # xlib pixbuf needed for exporting the stage
        BACKEND_PC_FILES="gdk-pixbuf-xlib-2.0"
    fi

    GLX_LIBS="$X11_LIBS -lGL"
    GLX_CFLAGS="$X11_CFLAGS"
    backendextra=x11
    backendextralib="x11/libclutter-x11.la"
    ;;

  eglx)

    CLUTTER_FLAVOUR="eglx"
    CLUTTER_STAGE_TYPE="CLUTTER_TYPE_STAGE_EGL"
    AC_DEFINE([HAVE_CLUTTER_EGL], 1, [Have the EGL backend])

    EGL_LIBS="$GLES_LIBS $X11_LIBS"
    EGL_CFLAGS="$GLES_CFLAGS $X11_CFLAGS"
    backendextra=x11
    backendextralib="x11/libclutter-x11.la"
    ;;

  eglnative)

    CLUTTER_FLAVOUR="eglnative"
    CLUTTER_STAGE_TYPE="CLUTTER_TYPE_STAGE_EGLNATIVE"
    AC_DEFINE([HAVE_CLUTTER_EGL], 1, [Have the EGL backend])

    PKG_CHECK_MODULES(TSLIB, tslib-1.0, [have_tslib=yes], [have_tslib=no])
    if test x$have_tslib = xyes; then
           AC_DEFINE([HAVE_TSLIB], 1, [Have tslib for touchscreen handling])
    fi

    EGL_LIBS="$GLES_LIBS $TSLIB_LIBS"
    EGL_CFLAGS="$TSLIB_CFLAGS"
    ;;

  fruity)
    CLUTTER_FLAVOUR="fruity"
    CLUTTER_STAGE_TYPE="CLUTTER_TYPE_STAGE_FRUITY"
    AC_DEFINE([HAVE_CLUTTER_FRUITY], 1, [We're building a fruity version of the eglnative backend])

    if test "x$glesversion" != "x1.1"; then
       AC_MSG_ERROR([Fruity backend only supports GL ES 1.1.]);
    fi

    EGL_LIBS="-ObjC -framework Foundation  -framework CoreFoundation  -framework CoreGraphics  -framework CoreSurface  -framework GraphicsServices  -framework OpenGLES  -framework LayerKit  -framework UIKit"
    EGL_CFLAGS=""
     ;;

  osx)

    clutter_gl_header="OpenGL/gl.h"
    CLUTTER_FLAVOUR="osx"
    CLUTTER_STAGE_TYPE="CLUTTER_TYPE_STAGE_OSX"
    AC_DEFINE([HAVE_CLUTTER_OSX], [1], [Have the OSX backend])

    CLUTTER_COGL="gl"
    AC_DEFINE([HAVE_COGL_GL], [1], [Have GL for rendering])

    OSX_LIBS="-framework Cocoa -framework OpenGL"
    AC_CHECK_HEADERS([$clutter_gl_header],,
                     [AC_MSG_ERROR([Unable to locate required GL headers])])
    ;;

  win32)

    clutter_gl_header="GL/gl.h"
    CLUTTER_FLAVOUR="win32"
    CLUTTER_STAGE_TYPE="CLUTTER_TYPE_STAGE_WIN32"
    AC_DEFINE([HAVE_CLUTTER_WIN32], 1, [Have the Win32 backend])

    CLUTTER_COGL="gl"
    AC_DEFINE([HAVE_COGL_GL], 1, [Have GL for rendering])

    AC_CHECK_HEADERS([$clutter_gl_header],,
                     [AC_MSG_ERROR([Unable to locate required GL headers])])

    dnl Use GLee under Windows instead of GL
    AC_CHECK_LIB(GLee, GLeeInit, HAVE_LIBGLEE=yes, HAVE_LIBGLEE=no, -lopengl32)
    if test "x$HAVE_LIBGLEE" = "xno"; then
      AC_MSG_ERROR([libGLee not found]);
    fi

    WIN32_CFLAGS="-D_WIN32_WINNT=0x0500"
    WIN32_LIBS="-lGLee -lopengl32 -lgdi32 -lwinmm"
    CLUTTER_LT_LDFLAGS="$CLUTTER_LT_LDFLAGS -no-undefined"
    ;;

  *) AC_MSG_ERROR([Invalid backend for Clutter: use glx,sdl,osx,win32,eglx, eglnative or fruity])
    ;;

esac




CLUTTER_GL_HEADER=$clutter_gl_header

AC_SUBST([clutterbackend])
AC_SUBST([imagebackend])
AC_SUBST([backendextra])
AC_SUBST([backendextralib])
AC_SUBST(CLUTTER_FLAVOUR)
AC_SUBST(CLUTTER_COGL)
AC_SUBST(CLUTTER_GL_HEADER)
AC_SUBST(CLUTTER_STAGE_TYPE)

clutterbackendlib=libclutter$CLUTTER_REAL-$clutterbackend-$CLUTTER_MAJORMINOR.la
AC_SUBST([clutterbackendlib])

dnl ========================================================================

# allow building clutter with an external dependency on json-glib
# using the --with-json=check argument, but keep the default to
# the internal version
AC_ARG_WITH([json],
            AC_HELP_STRING([--with-json=@<:@internal/check@:>@],
                           [Select the JSON-GLib copy to use @<:@default=internal@:>@]),
            [],
            [with_json=internal])

case $with_json in
        internal|check) ;;
        *) AC_MSG_ERROR([Invalid value for the JSON library: use internal or check]) ;;
esac

if test "x$with_json" = "xinternal"; then
        JSON_PREFIX=json
        have_json=no
else
        # if the user asked for it and if we have json-glib installed,
        # prefer the system library instead of the internal copy
        AC_MSG_CHECKING([for installed JSON-GLib])
        PKG_CHECK_EXISTS(json-glib-1.0, [have_json=yes], [have_json=no])
        if test "x$have_json" = "xyes"; then
                JSON_PREFIX=json-glib
                JSON_GLIB_PC=json-glib-1.0
                AC_DEFINE(HAVE_JSON_GLIB, 1, [Have the JSON-GLib library installed])
                AC_MSG_RESULT([found])
        else
                JSON_PREFIX=json
                AC_MSG_RESULT([not found, using internal copy])
        fi
fi

AC_SUBST(JSON_PREFIX)
AM_CONDITIONAL(LOCAL_JSON_GLIB, test "x$have_json" = "xno")

CLUTTER_REQUIRES="pangoft2 glib-2.0 >= 2.14 gobject-2.0 gthread-2.0 gmodule-2.0 $BACKEND_PC_FILES $JSON_GLIB_PC"

if test "x$imagebackend" = "xgdk-pixbuf"; then
        CLUTTER_REQUIRES="$CLUTTER_REQUIRES gdk-pixbuf-2.0"
fi

PKG_CHECK_MODULES(CLUTTER_DEPS, [$CLUTTER_REQUIRES])

AC_SUBST(CLUTTER_REQUIRES)

# prefixes for fixing gtk-doc references
GLIB_PREFIX="`$PKG_CONFIG --variable=prefix glib-2.0`"
PANGO_PREFIX="`$PKG_CONFIG --variable=prefix pango`"
GDKPIXBUF_PREFIX="`$PKG_CONFIG --variable=prefix pango`"
AC_SUBST(GLIB_PREFIX)
AC_SUBST(PANGO_PREFIX)
AC_SUBST(GDKPIXBUF_PREFIX)

dnl ========================================================================

if test "x$GCC" = "xyes"; then
        GCC_FLAGS="-g -Wall"
fi

dnl = Enable debug level ===================================================

m4_define([debug_default],
          m4_if(m4_eval(clutter_minor_version % 2), [1], [yes], [minimum]))

AC_ARG_ENABLE(debug,
              AC_HELP_STRING([--enable-debug=@<:@no/minimum/yes@:>@],
                             [turn on debugging. yes; All glib asserts, checks and runtime clutter verbose messages. minimum; Just glib cast checks and runtime clutter verbose messagaes. no; No glib asserts or checks and no runtime clutter verbose messages.  @<:@default=debug_default@:>@]),
,
              enable_debug=debug_default)

if test "x$enable_debug" = "xyes"; then
  test "$cflags_set" = set || CFLAGS="$CFLAGS -g"
  CLUTTER_DEBUG_CFLAGS="-DCLUTTER_ENABLE_DEBUG"
else
  if test "x$enable_debug" = "xno"; then
    CLUTTER_DEBUG_CFLAGS="-DG_DISABLE_ASSERT -DG_DISABLE_CHECKS -DG_DISABLE_CAST_CHECKS"
  else # minimum
    CLUTTER_DEBUG_CFLAGS="-DCLUTTER_ENABLE_DEBUG -DG_DISABLE_CAST_CHECKS"
  fi
fi

AC_SUBST(CLUTTER_DEBUG_CFLAGS)

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

# use strict compiler flags only on development releases
#m4_define([maintainer_flags_default],
#          m4_if(m4_eval(clutter_minor_version % 2), [1], [yes], [no]))
m4_define([maintainer_flags_default], [no])
AC_ARG_ENABLE([maintainer-flags],
              AC_HELP_STRING([--enable-maintainer-flags=@<:@no/yes@:>@],
                             [Use strict compiler flags @<:@default=maintainer_flags_default@:>@]),,
              enable_maintainer_flags=maintainer_flags_default)

if test "x$enable_maintainer_flags" = "xyes"; then
  CPPFLAGS="$CPPFLAGS -Werror -Wall -Wshadow -Wcast-align -Wno-uninitialized"
fi


dnl = GTK Doc check ========================================================

GTK_DOC_CHECK([1.8])

dnl = Manual ===============================================================

AC_ARG_ENABLE(manual,
              AC_HELP_STRING([--enable-manual=@<:@no/yes@:>@],
                             [Build application developers manual. Requires jw and xmlto binaries.]),
              enable_manual=$enableval, enable_manual=no)

if test "x$enable_manual" = "xyes"; then
  AC_PATH_PROG(JW, jw, no)
  if test "x$JW" = "xno"; then
    AC_MSG_ERROR(['jw' program needed by the manual not found in path])
  fi

  AC_PATH_PROG(XMLTO, xmlto, no)
  if test "x$XMLTO" = "xno"; then
    AC_MSG_ERROR(['xmlto' program needed by the manual not found in path])
  fi
fi

AM_CONDITIONAL(ENABLE_MANUAL, test "x$enable_manual" != "xno")

dnl ========================================================================

AC_SUBST(GCC_FLAGS)

CLUTTER_CFLAGS="$SDL_CFLAGS $EGL_CFLAGS $GLX_CFLAGS $OSX_CFLAGS $WIN32_CFLAGS $CLUTTER_DEPS_CFLAGS"
CLUTTER_LIBS="$SDL_LIBS $EGL_LIBS $GLX_LIBS $OSX_LIBS $WIN32_LIBS $CLUTTER_DEPS_LIBS"

AC_SUBST(CLUTTER_CFLAGS)
AC_SUBST(CLUTTER_LIBS)

AC_CONFIG_FILES([
        Makefile
        clutter/Makefile
        clutter/clutter-version.h
        clutter/clutter-json.h
        clutter/x11/Makefile
        clutter/x11/clutter-x11.pc
        clutter/glx/Makefile
        clutter/eglx/Makefile
        clutter/eglnative/Makefile
        clutter/fruity/Makefile
        clutter/osx/Makefile
        clutter/win32/Makefile
        clutter/win32/clutter-win32.pc
        clutter/sdl/Makefile
        clutter/cogl/Makefile
	clutter/cogl/common/Makefile
        clutter/cogl/cogl.h
        clutter/cogl/cogl-defines-gl.h:clutter/cogl/gl/cogl-defines.h.in
        clutter/cogl/cogl-defines-gles.h:clutter/cogl/gles/cogl-defines.h.in
        clutter/cogl/gl/Makefile
        clutter/cogl/gles/Makefile
        clutter/json/Makefile
        clutter/pango/Makefile
        tests/Makefile
        doc/Makefile
        doc/reference/Makefile
        doc/reference/clutter/Makefile
        doc/reference/clutter/version.xml
        doc/reference/cogl/Makefile
        doc/manual/clutter-manual.xml
        doc/manual/Makefile
        clutter.pc
])

AC_OUTPUT

dnl ========================================================================

echo ""
echo "                    Clutter $VERSION"
echo "                 ==================="
echo ""
echo "                   prefix:   ${prefix}"
echo ""
echo "                  Flavour:   ${clutterbackend}/${CLUTTER_COGL}"
echo "               GL Headers:   ${CLUTTER_GL_HEADER}"
echo "           Target library:   ${clutterbackendlib}"
echo "              Debug level:   ${enable_debug}"
echo "           Compiler flags:   ${CPPFLAGS}"
echo "        API Documentation:   ${enable_gtk_doc}"
echo "     Manual Documentation:   ${enable_manual}"
echo ""


# you can add more configuration options or flags that will bring up the
# the experimental/unstable warning summary.

if test "x$imagebackend" = "xinternal"; then
  experimental_stuff="$experimental_stuff imagebackend=$imagebackend\n"
fi
if test "x$clutterbackend" = "xfruity"; then
  experimental_stuff="$experimental_stuff clutterbackend=$clutterbackend\n"
fi


if test "x$experimental_stuff" != "x"; then
echo ""
echo "☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠"
echo " *WARNING*"
echo ""
echo "  Experimental features configured, stability of your build either uses"
echo "  experimental backends or experimental and unsupported features:"
echo -e "   $experimental_stuff"
echo "☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠☠"
echo ""
fi