$FreeBSD$

--- c_src/Makefile.orig
+++ c_src/Makefile
@@ -11,7 +11,7 @@
 include ../win32_conf/mingw_vars.mk
 else
 
-  OGLDIR  = /usr
+  OGLDIR  = ${X11BASE}
 
 # Uncomment these if your opengl header is located in another directory than
 # the usual $(OGLDIR)/include/GL/gl.h
@@ -21,14 +21,13 @@
   GL_LIBS		= -L$(OGLDIR)/lib -lGL -lGLU 
   GL_INCS		= -I$(OGLDIR)/include/$(GL_INCLUDE_DIR)
 
-  SDL_LIBS		= $(shell sdl-config --libs)
-  SDL_INCS		= $(shell sdl-config --cflags)
+  SDL_LIBS		= $(shell $(SDL_CONFIG) --libs)
+  SDL_INCS		= $(shell $(SDL_CONFIG) --cflags)
 
   LIBS			= $(GL_LIBS) $(SDL_LIBS) -lm 
 
-  CFLAGS		= -g -O2 -funroll-loops -Wall -ffast-math -fpic \
-			-fomit-frame-pointer $(USE_GL_INCLUDE_DIR) -DSHM \
-			-DPTHREADS $(GL_INCS) $(SDL_INCS) $(ERL_INCS)
+  CFLAGS		+= -O2 -funroll-loops -Wall -ffast-math -fpic -fomit-frame-pointer \
+			$(USE_GL_INCLUDE_DIR) -DSHM -DPTHREADS $(GL_INCS) $(SDL_INCS) $(ERL_INCS)
 
   CLINKFLAGS 		=  -fpic -shared  
 
@@ -38,13 +37,13 @@
   ERL_DIR := $(shell echo 'io:format("~s~n",[code:root_dir()]),halt().' | erl | grep '1>' | sed 's,^[0-9]*> *,,g')
   ERL_INCS = -I$(ERL_DIR)/usr/include
 
-  CC = gcc
+  CC ?= gcc
 
 endif
 
 TARGETDIR = ../priv
 
-GCC_O	= $(CC) -c $(CFLAGS) $<
+GCC_O	= $(CC) -c $(CFLAGS) $(INCS) $(ERLINC) $<
 
 # Files