diff --git a/configure.in b/configure.in
index ee1041c5..657a3015 100644
--- a/configure.in
+++ b/configure.in
@@ -26,7 +26,7 @@ AM_PATH_SDL($SDL_VERSION,
 	    AC_MSG_ERROR([*** SDL version $SDL_VERSION not found!])
 )
 LIBS="$LIBS $SDL_LIBS"
-CXXFLAGS="$CXXFLAGS $SDL_CFLAGS"
+CPPFLAGS="$CPPFLAGS $SDL_CFLAGS"
 
 dnl Checks for header files.
 
@@ -144,7 +144,7 @@ fi
 
 AH_TEMPLATE(C_MODEM,[Define to 1 to enable internal modem support, requires SDL_net])
 AH_TEMPLATE(C_IPX,[Define to 1 to enable IPX over Internet networking, requires SDL_net])
-AC_CHECK_HEADER(SDL/SDL_net.h,have_sdl_net_h=yes,)
+AC_CHECK_HEADER(SDL_net.h,have_sdl_net_h=yes,)
 AC_CHECK_LIB(SDL_net, SDLNet_Init, have_sdl_net_lib=yes, , )
 if test x$have_sdl_net_lib = xyes -a x$have_sdl_net_h = xyes ; then
   LIBS="$LIBS -lSDL_net"