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--- a/configure.ac
+++ b/configure.ac
@@ -281,22 +281,14 @@
AC_CHECK_HEADER(SDL_rotozoom.h,,AC_MSG_ERROR(Please install SDL_gfx))
AC_CHECK_LIB(SDL_gfx, rotozoomSurfaceXY,, AC_MSG_ERROR(Please install SDL_gfx))
AC_MSG_CHECKING([whether SDL_gfx - version >= 2.0.22 ])
-AC_RUN_IFELSE([
-#include <stdio.h>
+AC_COMPILE_IFELSE([
#include <SDL_gfxPrimitives.h>
-#undef main
-int main(void)
-{
- FILE *f = fopen("conftest.out", "wt+");
- fprintf(f, "%i.%i.%i\n",
- SDL_GFXPRIMITIVES_MAJOR, SDL_GFXPRIMITIVES_MINOR, SDL_GFXPRIMITIVES_MICRO);
- fclose(f);
- int ver = SDL_GFXPRIMITIVES_MAJOR*1000+SDL_GFXPRIMITIVES_MINOR*100+SDL_GFXPRIMITIVES_MICRO;
- return ver < 2022;
-}],
- [echo "`cat conftest.out`, OK"],
- [cat conftest.out
- AC_MSG_ERROR(Please upgrade SDL_gfx)])
+#if SDL_GFXPRIMITIVES_MAJOR < 2 || (SDL_GFXPRIMITIVES_MAJOR == 2 && SDL_GFXPRIMITIVES_MINOR == 0 && SDL_GFXPRIMITIVES_MICRO < 22)
+#error too old
+#endif
+],
+ [echo "OK"],
+ [AC_MSG_ERROR(Please upgrade SDL_gfx)])
dnl === Check for curl =====================================================
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