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

diff -Naurp lzip.orig/configure lzip/configure
--- lzip.orig/configure
+++ lzip/configure
@@ -23,9 +23,9 @@ datarootdir='$(prefix)/share'
 infodir='$(datarootdir)/info'
 mandir='$(datarootdir)/man'
 CXX=g++
-CPPFLAGS=
-CXXFLAGS='-Wall -W -O2'
-LDFLAGS=
+#CPPFLAGS=
+#CXXFLAGS='-Wall -W -O2'
+#LDFLAGS=
 
 # checking whether we are using GNU C++.
 if [ ! -x /bin/g++ ] &&