Author: Daniel Baumann <daniel.baumann@progress-linux.org>
Description: Avoid overwriting build-environment.

diff -Naurp clzip.orig/configure clzip/configure
--- clzip.orig/configure
+++ clzip/configure
@@ -20,10 +20,10 @@ bindir='$(exec_prefix)/bin'
 datarootdir='$(prefix)/share'
 infodir='$(datarootdir)/info'
 mandir='$(datarootdir)/man'
-CC=gcc
-CPPFLAGS=
-CFLAGS='-Wall -W -O2'
-LDFLAGS=
+#CC=gcc
+#CPPFLAGS=
+#CFLAGS='-Wall -W -O2'
+#LDFLAGS=
 
 # checking whether we are using GNU C.
 if /bin/sh -c "${CC} --version" > /dev/null 2>&1 ; then true