diff --git a/GNUmakefile b/GNUmakefile
index 2151e5db..662f205a 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -74,11 +74,6 @@ IS_CYGWIN = $(shell $(CXX) -dumpmachine 2>&1 | $(EGREP) -i -c "cygwin")
 IS_OPENBSD = $(shell $(CXX) -dumpmachine 2>&1 | $(EGREP) -i -c "openbsd")
 IS_SUN = $(shell echo $SYSTEM | $(EGREP) -i -c "SunOS")
 IS_FEDORA22_i686 = $(shell echo $RELEASE | $(EGREP) -i -c "fc22.i686")
-IS_CENTOS = $(shell lsb_release -si | $(EGREP) -i -c "CentOS")
-
-ifneq ($(IS_CENTOS),0)
-IS_CENTOS_5 = $(shell lsb_release -sr | $(EGREP) -i -c "5\.")
-endif
 
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 # May (or may not) be used below