TCLLIBRARY = /usr/local/lib/tcl
 TKLIBRARY = /usr/local/lib/tk
 
+SDLINCLUDE =
+SDLLIBS = -lSDL -lSDL_mixer
+ 
+#SDLINCLUDE += $$(pkg-config -cflags sdl)
+#SDLLIBS += $$(pkg-config -libs sdl)
+
 CC = gcc
 
 OPTFLAGS = -O3
        -I$(XINCLUDE) \
        -I$(TCLHOME) \
        -I$(TCLXHOME)/src \
-       -I$(TKHOME)
+       -I$(TKHOME) \
+       $(SDLINCLUDE)
 
 CPPFLAGS = $(INCLUDES)
 
        -lm \
         -lX11 \
         -lXext \
-       -lXpm
+       -lXpm \
+       $(SDLLIBS)
 
 SRCS = \
        sim.c \