--- lzip-1.17.orig/configure	2015-07-09 18:58:33.000000000 +0200
+++ lzip-1.17/configure	2016-09-24 13:07:38.493476268 +0200
@@ -20,10 +20,10 @@ bindir='$(exec_prefix)/bin'
 datarootdir='$(prefix)/share'
 infodir='$(datarootdir)/info'
 mandir='$(datarootdir)/man'
-CXX=g++
-CPPFLAGS=
-CXXFLAGS='-Wall -W -O2'
-LDFLAGS=
+CXX?=g++
+CPPFLAGS?=
+CXXFLAGS?='-Wall -W -O2'
+LDFLAGS?=
 
 # checking whether we are using GNU C++.
 ${CXX} --version > /dev/null 2>&1