Author: Daniel Baumann <mail@daniel-baumann.ch>
Description: Avoid overwriting build-environment.

diff -Naurp pdlzip.orig/configure pdlzip/configure
--- pdlzip.orig/configure
+++ pdlzip/configure
@@ -21,9 +21,9 @@ datarootdir='$(prefix)/share'
 infodir='$(datarootdir)/info'
 mandir='$(datarootdir)/man'
 CC=gcc
-CPPFLAGS=
-CFLAGS='-Wall -W -O2'
-LDFLAGS=
+#CPPFLAGS=
+#CFLAGS='-Wall -W -O2'
+#LDFLAGS=
 
 # checking whether we are using GNU C.
 ${CC} --version > /dev/null 2>&1