--- a/configure	2010-07-04 10:04:47.000000000 +0530
+++ b/configure	2010-07-04 10:04:41.000000000 +0530
@@ -5,7 +5,8 @@
 CXX="g++"
 enable_lcms="no"
 enable_openmp="no"
-CFLAGS="-O4 -I. -w $CFLAGS"
+CFLAGS_DEFAULT="-O4 -w"
+CFLAGS_ADD="-I."
 LDFLAGS=
 DESTDIR=""
 PREFIX="/usr/local"
@@ -121,14 +122,14 @@
 if [ "$enable_lcms" = "yes" ]; then
 	echo "yes"
 	check_lib lcms cmsErrorAction $lcms_libs
-	CFLAGS="$CFLAGS -DUSE_LCMS -I$lcms_headers"
+	CFLAGS_DEFAULT="$CFLAGS_DEFAULT -DUSE_LCMS -I$lcms_headers"
 else
 	echo "no"
 fi
 
 printf "Enable openmp support... "
 if [ "$enable_openmp" = "yes" ]; then
-	CFLAGS="$CFLAGS -fopenmp"
+	CFLAGS_DEFAULT="$CFLAGS_DEFAULT -fopenmp"
 	echo "yes"
 else
 	echo "no"
@@ -141,7 +142,11 @@
 
 echo "CC = $CC" >> Makefile
 echo "CXX = $CXX" >> Makefile
-echo "CFLAGS = $CFLAGS" >> Makefile
+if [ -z "$CFLAGS" ]; then
+	echo "CFLAGS = $CFLAGS_ADD $CFLAGS_DEFAULT" >> Makefile
+else
+	echo "CFLAGS = $CFLAGS_ADD $CFLAGS" >> Makefile
+fi
 echo "CXXFLAGS = \$(CFLAGS)" >> Makefile
 echo "LDFLAGS = $LDFLAGS" >> Makefile
 echo "DESTDIR = $DESTDIR" >> Makefile