diff -Naupr camE-1.9.orig/Makefile camE-1.9/Makefile
--- camE-1.9.orig/Makefile	2003-06-25 10:16:04.000000000 +0200
+++ camE-1.9/Makefile	2006-08-30 11:15:42.000000000 +0200
@@ -7,7 +7,8 @@ bindir=$(ROOT)${exec_prefix}/bin
 mandir=$(ROOT)${prefix}/man
 
 CC=gcc
-CFLAGS=-O3 -g -Wall -I$(srcdir)/.. -I.. -D_GNU_SOURCE `giblib-config --cflags`
+CFLAGS?=-O3 -g -Wall 
+CFLAGS+=-I$(srcdir)/.. -I.. -D_GNU_SOURCE `giblib-config --cflags`
 
 INSTALL=/usr/bin/install -c
 INSTALL_PROGRAM=${INSTALL}