--- configure
+++ configure
@@ -775,9 +775,9 @@
 # udpate Makefile with the configure results
 sed < Makefile.in "
 /^CC *=/s#=.*#=$CC#
-/^CFLAGS *=/s#=.*#=$CFLAGS#
+/^CFLAGS *=/s#=.*#+=$CFLAGS#
 /^SFLAGS *=/s#=.*#=$SFLAGS#
-/^LDFLAGS *=/s#=.*#=$LDFLAGS#
+/^LDFLAGS *=/s#=.*#+=$LDFLAGS#
 /^LDSHARED *=/s#=.*#=$LDSHARED#
 /^CPP *=/s#=.*#=$CPP#
 /^STATICLIB *=/s#=.*#=$STATICLIB#