Index: src/tcl/makefile
--- src/tcl/makefile.orig
+++ src/tcl/makefile
@@ -24,9 +24,8 @@
 
 TCL_LIBRARY =	/usr/local/lib/tcl
 
-CC =		gcc
-
-CFLAGS =	-O3 -I. -DTCL_LIBRARY=\"${TCL_LIBRARY}\" -DIS_LINUX
+EXTRA_CFLAGS =	-I. -DTCL_LIBRARY=\"${TCL_LIBRARY}\" -DIS_LINUX
+CFLAGS +=	$(EXTRA_CFLAGS)
 #CFLAGS =	-g -I. -DTCL_LIBRARY=\"${TCL_LIBRARY}\" -DIS_LINUX
 
 GENERIC_OBJS = \
