diff -Naur esdl-1.0.1/c_src/Makefile esdl-1.0.1.tpg/c_src/Makefile
--- esdl-1.0.1/c_src/Makefile	2009-05-20 18:34:48.000000000 +0000
+++ esdl-1.0.1.tpg/c_src/Makefile	2009-06-15 19:00:56.000000000 +0000
@@ -43,12 +43,12 @@
   INCS                  = $(GL_INCS) $(SDL_INCS)  $(SDL_TTF_INCS) \
                           $(SDL_IMAGE_INCS) $(ERL_INCS)
 
-  CFLAGS		= -g -O2 -funroll-loops -Wall -ffast-math -fpic \
+  CFLAGS		+= -g -O2 -funroll-loops -Wall -ffast-math -fpic \
 			-fomit-frame-pointer $(USE_GL_INCLUDE_DIR) -DSHM \
                         $(USE_SDL_TTF) $(USE_SDL_IMAGE) \
 			-DPTHREADS $(INCS)
 
-  CLINKFLAGS 		=  -fpic -shared  
+  CLINKFLAGS 		+=  -fpic -shared  
 
   SOEXT = so