diff --git a/configure.ac b/configure.ac
index 99fbae2..6635eac 100644
--- a/configure.ac
+++ b/configure.ac
@@ -25,9 +25,6 @@ PKG_CHECK_MODULES(SDL, [
 	SDL_image >= 1.2
 	SDL_mixer >= 1.2
 ])
-AC_SUBST(SDL_CFLAGS)
-AC_SUBST(SDL_LIBS)
-
 PKG_CHECK_MODULES(GL, gl)
 PKG_CHECK_MODULES(GLU, glu)
 PKG_CHECK_MODULES(ZLIB, zlib)