diff --git a/BasiliskII/src/Unix/configure.ac b/BasiliskII/src/Unix/configure.ac
index 83aa4a85..a1476761 100644
--- a/BasiliskII/src/Unix/configure.ac
+++ b/BasiliskII/src/Unix/configure.ac
@@ -226,12 +226,13 @@ if [[ "x$WANT_SDL" = "xyes" ]]; then
     ac_cv_framework_SDL=no
   fi
   if [[ "x$ac_cv_framework_SDL" = "xno" ]]; then
-   PKG_CHECK_MODULES([sdl], [sdl >= 1.2], [], [
+   PKG_CHECK_MODULES([sdl], [sdl >= 1.2], [
+     CFLAGS="$CFLAGS $sdl_CFLAGS"
+     CXXFLAGS="$CXXFLAGS $sdl_CFLAGS"
+     LIBS="$LIBS $sdl_LIBS"
+   ], [
      WANT_SDL=no
    ])
-   CFLAGS="$CFLAGS $SDL_CFLAGS"
-   CXXFLAGS="$CXXFLAGS $SDL_CFLAGS"
-   LIBS="$LIBS $SDL_LIBS"
   fi
   SDL_SUPPORT=`echo "$SDL_SUPPORT" | sed -e "s/^ //"`
 else