# Configure paths for SDL# Sam Lantinga 9/21/99# stolen from Manish Singh# stolen back from Frank Belew# stolen from Manish Singh# Shamelessly stolen from Owen Taylordnl AM_PATH_SDL([MINIMUM-VERSION, [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]])dnl Test for SDL, and define SDL_CFLAGS and SDL_LIBSdnlAC_DEFUN(AM_PATH_SDL,[dnl dnl Get the cflags and libraries from the sdl-config scriptdnlAC_ARG_WITH(sdl-prefix,[  --with-sdl-prefix=PFX   Prefix where SDL is installed (optional)],            sdl_prefix="$withval", sdl_prefix="")AC_ARG_WITH(sdl-exec-prefix,[  --with-sdl-exec-prefix=PFX Exec prefix where SDL is installed (optional)],            sdl_exec_prefix="$withval", sdl_exec_prefix="")AC_ARG_ENABLE(sdltest, [  --disable-sdltest       Do not try to compile and run a test SDL program],		    , enable_sdltest=yes)  if test x$sdl_exec_prefix != x ; then     sdl_args="$sdl_args --exec-prefix=$sdl_exec_prefix"     if test x${SDL_CONFIG+set} != xset ; then        SDL_CONFIG=$sdl_exec_prefix/bin/sdl-config     fi  fi  if test x$sdl_prefix != x ; then     sdl_args="$sdl_args --prefix=$sdl_prefix"     if test x${SDL_CONFIG+set} != xset ; then        SDL_CONFIG=$sdl_prefix/bin/sdl-config     fi  fi  AC_PATH_PROG(SDL_CONFIG, sdl-config, no)  min_sdl_version=ifelse([$1], ,0.11.0,$1)  AC_MSG_CHECKING(for SDL - version >= $min_sdl_version)  no_sdl=""  if test "$SDL_CONFIG" = "no" ; then    no_sdl=yes  else    SDL_CFLAGS=`$SDL_CONFIG $sdlconf_args --cflags`    SDL_LIBS=`$SDL_CONFIG $sdlconf_args --libs`    sdl_major_version=`$SDL_CONFIG $sdl_args --version | \           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\1/'`    sdl_minor_version=`$SDL_CONFIG $sdl_args --version | \           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\2/'`    sdl_micro_version=`$SDL_CONFIG $sdl_config_args --version | \           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\3/'`    if test "x$enable_sdltest" = "xyes" ; then      ac_save_CFLAGS="$CFLAGS"      ac_save_LIBS="$LIBS"      CFLAGS="$CFLAGS $SDL_CFLAGS"      LIBS="$LIBS $SDL_LIBS"dnldnl Now check if the installed SDL is sufficiently new. (Also sanitydnl checks the results of sdl-config to some extentdnl      rm -f conf.sdltest      AC_TRY_RUN([#include <stdio.h>#include <stdlib.h>#include <string.h>#include "SDL.h"char*my_strdup (char *str){  char *new_str;    if (str)    {      new_str = (char *)malloc ((strlen (str) + 1) * sizeof(char));      strcpy (new_str, str);    }  else    new_str = NULL;    return new_str;}int main (int argc, char *argv[]){  int major, minor, micro;  char *tmp_version;  /* This hangs on some systems (?)  system ("touch conf.sdltest");  */  { FILE *fp = fopen("conf.sdltest", "a"); if ( fp ) fclose(fp); }  /* HP/UX 9 (%@#!) writes to sscanf strings */  tmp_version = my_strdup("$min_sdl_version");  if (sscanf(tmp_version, "%d.%d.%d", &major, &minor, &micro) != 3) {     printf("%s, bad version string\n", "$min_sdl_version");     exit(1);   }   if (($sdl_major_version > major) ||      (($sdl_major_version == major) && ($sdl_minor_version > minor)) ||      (($sdl_major_version == major) && ($sdl_minor_version == minor) && ($sdl_micro_version >= micro)))    {      return 0;    }  else    {      printf("\n*** 'sdl-config --version' returned %d.%d.%d, but the minimum version\n", $sdl_major_version, $sdl_minor_version, $sdl_micro_version);      printf("*** of SDL required is %d.%d.%d. If sdl-config is correct, then it is\n", major, minor, micro);      printf("*** best to upgrade to the required version.\n");      printf("*** If sdl-config was wrong, set the environment variable SDL_CONFIG\n");      printf("*** to point to the correct copy of sdl-config, and remove the file\n");      printf("*** config.cache before re-running configure\n");      return 1;    }}],, no_sdl=yes,[echo $ac_n "cross compiling; assumed OK... $ac_c"])       CFLAGS="$ac_save_CFLAGS"       LIBS="$ac_save_LIBS"     fi  fi  if test "x$no_sdl" = x ; then     AC_MSG_RESULT(yes)     ifelse([$2], , :, [$2])       else     AC_MSG_RESULT(no)     if test "$SDL_CONFIG" = "no" ; then       echo "*** The sdl-config script installed by SDL could not be found"       echo "*** If SDL was installed in PREFIX, make sure PREFIX/bin is in"       echo "*** your path, or set the SDL_CONFIG environment variable to the"       echo "*** full path to sdl-config."     else       if test -f conf.sdltest ; then        :       else          echo "*** Could not run SDL test program, checking why..."          CFLAGS="$CFLAGS $SDL_CFLAGS"          LIBS="$LIBS $SDL_LIBS"          AC_TRY_LINK([#include <stdio.h>#include "SDL.h"],      [ return 0; ],        [ echo "*** The test program compiled, but did not run. This usually means"          echo "*** that the run-time linker is not finding SDL or finding the wrong"          echo "*** version of SDL. If it is not finding SDL, you'll need to set your"          echo "*** LD_LIBRARY_PATH environment variable, or edit /etc/ld.so.conf to point"          echo "*** to the installed location  Also, make sure you have run ldconfig if that"          echo "*** is required on your system"	  echo "***"          echo "*** If you have an old version installed, it is best to remove it, although"          echo "*** you may also be able to get things to work by modifying LD_LIBRARY_PATH"],        [ echo "*** The test program failed to compile or link. See the file config.log for the"          echo "*** exact error that occured. This usually means SDL was incorrectly installed"          echo "*** or that you have moved SDL since it was installed. In the latter case, you"          echo "*** may want to edit the sdl-config script: $SDL_CONFIG" ])          CFLAGS="$ac_save_CFLAGS"          LIBS="$ac_save_LIBS"       fi     fi     SDL_CFLAGS=""     SDL_LIBS=""     ifelse([$3], , :, [$3])  fi  AC_SUBST(SDL_CFLAGS)  AC_SUBST(SDL_LIBS)  rm -f conf.sdltest])