diff -u -r ../lzip-1.19/configure ./configure
--- ../lzip-1.19/configure	2017-04-13 12:52:40.000000000 +0200
+++ ./configure	2017-05-02 10:44:44.249358716 +0200
@@ -20,17 +20,10 @@
 datarootdir='$(prefix)/share'
 infodir='$(datarootdir)/info'
 mandir='$(datarootdir)/man'
-CXX=g++
-CPPFLAGS=
-CXXFLAGS='-Wall -W -O2'
-LDFLAGS=
-
-# checking whether we are using GNU C++.
-/bin/sh -c "${CXX} --version" > /dev/null 2>&1 ||
-	{
-	CXX=c++
-	CXXFLAGS=-O2
-	}
+CXX?=g++
+CPPFLAGS?=
+CXXFLAGS?='-Wall -W -O2'
+LDFLAGS?=
 
 # Loop over all args
 args=