--- ed-1.5.orig/configure	2010-08-30 16:34:49.000000000 +0200
+++ ed-1.5/configure	2011-12-05 13:26:17.990045908 +0100
@@ -26,10 +26,10 @@ infodir='$(datadir)/info'
 mandir='$(datadir)/man'
 sysconfdir='$(prefix)/etc'
 program_prefix=
-CC=
-CPPFLAGS=
-CFLAGS='-Wall -W -O2'
-LDFLAGS=
+CC?=
+CPPFLAGS?=
+CFLAGS?='-Wall -W -O2'
+LDFLAGS?=
 
 # Loop over all args
 while [ -n "$1" ] ; do