--- configure.orig	2007-12-07 17:24:34.000000000 -0600
+++ configure	2007-12-07 17:25:50.000000000 -0600
@@ -1,9 +1,9 @@
 #! /bin/sh
 
-CC="gcc"
-CXX="g++"
-CCFLAGS="$CCFLAGS -Wall -g"
-OPTIM="$OPTIM -O3 -funroll-loops"
+CC="${CC-gcc}"
+CXX="${CXX-g++}"
+CCFLAGS="${CFLAGS--Wall -g}"
+OPTIM=""
 LINKLIBS="-lz"
 
 # System-specific flags