Index: Makefile
--- Makefile.orig	2017-04-22 05:45:24.000000000 +0200
+++ Makefile	2017-10-31 09:45:04.085921000 +0100
@@ -6,6 +6,7 @@
 CFLAGS_DEFAULT=	-O2
 
 all: cpusupport-config.h
+	export CC="$${CC}}";	\
 	export CFLAGS="$${CFLAGS:-${CFLAGS_DEFAULT}}";	\
 	export LDADD_POSIX=`export CC="${CC}"; cd libcperciva/POSIX && command -p sh posix-l.sh "$$PATH"`;	\
 	export CFLAGS_POSIX=`export CC="${CC}"; cd libcperciva/POSIX && command -p sh posix-cflags.sh "$$PATH"`;	\