--- C/Makefile.orig	2015-05-18 19:48:09 UTC
+++ C/Makefile
@@ -6,7 +6,7 @@
 #  $Id$
 #
 
-CC = cc
+CC ?= cc
 # for tests.done
 DC = gdc
 
@@ -34,7 +34,7 @@ TEST = test
 ###
 # installation options
 #
-prefix = /usr/local
+prefix ?= /usr/local
 LOCALEDIR = $(prefix)/share/locale
 
 ###
@@ -141,7 +141,7 @@ bsd43-cc:
 	$(MAKE) _MKCONFIG_SHELL=$(MKCONFIG_SHELL) \
 		CC=cc LD=cc EXE_EXT="" OBJ_EXT=".o" \
 		CFLAGS="$(CFLAGS) -O" \
-		LDFLAGS="-O" di-programs
+		LDFLAGS="-O $(LDFLAGS)" di-programs
 
 .PHONY: bsd43-gcc
 bsd43-gcc:
@@ -155,7 +155,7 @@ bsd43-gcc:
 	$(MAKE) _MKCONFIG_SHELL=$(MKCONFIG_SHELL) \
 		CC=gcc LD=gcc EXE_EXT="" OBJ_EXT=".o" \
 		CFLAGS="$(CFLAGS) -O2" \
-		LDFLAGS="-O2" di-programs
+		LDFLAGS="-O2 $(LDFLAGS)" di-programs
 
 .PHONY: ultrix-cc
 ultrix-cc: