--- lib/unix/generic.t	Fri Jul 30 08:55:18 1999
+++ lib/unix/generic.t.new	Thu Apr  6 20:43:17 2000
@@ -150,10 +150,10 @@
 
 ####### Compiler, tools and options
 
-CC	=	#$ Expand("TMAKE_CC");
-CXX	=	#$ Expand("TMAKE_CXX");
-CFLAGS	=	#$ Expand("TMAKE_CFLAGS"); ExpandGlue("DEFINES","-D"," -D","");
-CXXFLAGS=	#$ Expand("TMAKE_CXXFLAGS"); ExpandGlue("DEFINES","-D"," -D","");
+CC	?=	#$ Expand("TMAKE_CC");
+CXX	?=	#$ Expand("TMAKE_CXX");
+CFLAGS	?=	#$ Expand("TMAKE_CFLAGS"); ExpandGlue("DEFINES","-D"," -D","");
+CXXFLAGS?=	#$ Expand("TMAKE_CXXFLAGS"); ExpandGlue("DEFINES","-D"," -D","");
 INCPATH	=	#$ ExpandPath("INCPATH","-I"," -I","");
 #$ Config("staticlib") && DisableOutput();
 LINK	=	#$ Expand("TMAKE_LINK");