dnl Process this file with autoconf to produce a configure script.

 AC_INIT(README)

 dnl Detect the canonical build and host environments

 AC_CONFIG_AUX_DIRS($srcdir/../build-scripts)

 AC_CANONICAL_HOST

 dnl Check for tools

 AC_PROG_CC

 dnl Check for compiler environment

 AC_C_CONST

 dnl We only care about this for building testnative at the moment, so these

 dnl  values shouldn't be considered absolute truth.

 dnl  (Haiku, for example, sets none of these.)

 ISUNIX="false"

 ISWINDOWS="false"

 ISMACOSX="false"

 dnl Figure out which math library to use

 case "$host" in

     *-*-cygwin* | *-*-mingw32*)

         ISWINDOWS="true"

         EXE=".exe"

         MATHLIB=""

         SYS_GL_LIBS="-lopengl32"

         ;;

     *-*-haiku*)

         EXE=""

         MATHLIB=""

         SYS_GL_LIBS="-lGL"

         ;;

     *-*-darwin* )

         ISMACOSX="true"

         EXE=""

         MATHLIB=""

         SYS_GL_LIBS="-Wl,-framework,OpenGL"

         ;;

     *-*-aix*)

         ISUNIX="true"

         EXE=""

         if test x$ac_cv_prog_gcc = xyes; then

             CFLAGS="-mthreads"

         fi

         SYS_GL_LIBS=""

         ;;

     *-*-mint*)

         EXE=""

         MATHLIB=""

         AC_PATH_PROG(OSMESA_CONFIG, osmesa-config, no)

         if test "x$OSMESA_CONFIG" = "xyes"; then

             OSMESA_CFLAGS=`$OSMESA_CONFIG --cflags`

             OSMESA_LIBS=`$OSMESA_CONFIG --libs`

             CFLAGS="$CFLAGS $OSMESA_CFLAGS"

             SYS_GL_LIBS="$OSMESA_LIBS"

         else

             SYS_GL_LIBS="-lOSMesa"

         fi

         ;;

     *-*-qnx*)

         EXE=""

         MATHLIB=""

         SYS_GL_LIBS="-lGLES_CM"

         ;;

     *-*-emscripten* )

         dnl This should really be .js, but we need to specify extra flags when compiling to js

         EXE=".bc"

         MATHLIB=""

         SYS_GL_LIBS=""

         ;;

     *)

         dnl Oh well, call it Unix...

         ISUNIX="true"

         EXE=""

         MATHLIB="-lm"

         SYS_GL_LIBS="-lGL"

         ;;

 esac

 AC_SUBST(EXE)

 AC_SUBST(MATHLIB)

 AC_SUBST(ISMACOSX)

 AC_SUBST(ISWINDOWS)

 AC_SUBST(ISUNIX)

 dnl Check for SDL

 SDL_VERSION=2.0.0

 AM_PATH_SDL2($SDL_VERSION,

             :,

 	    AC_MSG_ERROR([*** SDL version $SDL_VERSION not found!])

 )

 CFLAGS="$CFLAGS $SDL_CFLAGS"

 LIBS="$LIBS -lSDL2_test $SDL_LIBS"

 dnl Check for X11 path, needed for OpenGL on some systems

 AC_PATH_X

 if test x$have_x = xyes; then

     if test x$ac_x_includes = xno || test "x$ac_x_includes" = xNone || test "x$ac_x_includes" = x; then

         :

     else

         CFLAGS="$CFLAGS -I$ac_x_includes"

     fi

     if test x$ac_x_libraries = xno || test "x$ac_x_libraries" = xNone; then

         :

     else

         if test "x$ac_x_libraries" = x; then

             XPATH=""

             XLIB="-lX11"

         else

             XPATH="-L$ac_x_libraries"

             XLIB="-L$ac_x_libraries -lX11"

         fi

     fi

 fi

 dnl Check for OpenGL

 AC_MSG_CHECKING(for OpenGL support)

 have_opengl=no

 AC_TRY_COMPILE([

  #include "SDL_opengl.h"

 ],[

 ],[

 have_opengl=yes

 ])

 AC_MSG_RESULT($have_opengl)

 dnl Check for OpenGL ES

 AC_MSG_CHECKING(for OpenGL ES support)

 have_opengles=no

 AC_TRY_COMPILE([

  #if defined (__IPHONEOS__)

     #include <OpenGLES/ES1/gl.h>

  #else

     #include <GLES/gl.h>

  #endif /* __QNXNTO__ */

 ],[

 ],[

 have_opengles=yes

 ])

 AC_MSG_RESULT($have_opengles)

 dnl Check for OpenGL ES2

 AC_MSG_CHECKING(for OpenGL ES2 support)

 have_opengles2=no

 AC_TRY_COMPILE([

  #if defined (__IPHONEOS__)

     #include <OpenGLES/ES2/gl.h>

     #include <OpenGLES/ES2/glext.h>

  #else

     #include <GLES2/gl2.h>

     #include <GLES2/gl2ext.h>

  #endif

 ],[

 ],[

 have_opengles2=yes

 ])

 AC_MSG_RESULT($have_opengles2)

 GLLIB=""

 GLESLIB=""

 GLES2LIB=""

 if test x$have_opengles = xyes; then

     CFLAGS="$CFLAGS -DHAVE_OPENGLES"

     GLESLIB="$XPATH -lGLESv1_CM"

 fi

 if test x$have_opengles2 = xyes; then

     CFLAGS="$CFLAGS -DHAVE_OPENGLES2"

     #GLES2LIB="$XPATH -lGLESv2"

 fi

 if test x$have_opengl = xyes; then

     CFLAGS="$CFLAGS -DHAVE_OPENGL"

     GLLIB="$XPATH $SYS_GL_LIBS"

 fi

 AC_SUBST(GLLIB)

 AC_SUBST(GLESLIB)

 AC_SUBST(GLES2LIB)

 AC_SUBST(XLIB)

 dnl Check for SDL_ttf

 AC_CHECK_LIB(SDL2_ttf, TTF_Init, have_SDL_ttf=yes)

 if test x$have_SDL_ttf = xyes; then

     CFLAGS="$CFLAGS -DHAVE_SDL_TTF"

     SDL_TTF_LIB="-lSDL2_ttf"

 fi

 AC_SUBST(SDL_TTF_LIB)

 dnl Finally create all the generated files

 AC_OUTPUT([Makefile])