:: commit b8f87f23c2df445bc74336d66ce48a730fd013da

diff --git a/Makefile b/Makefile
index b0c9835..d042973 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 
-CC=clang
-CFLAGS=-O2 -march=native -mtune=native -Iinclude -flto -g3 -fPIC
+CC?=clang
+CFLAGS?=-O2 -march=native -mtune=native -Iinclude -flto -g3 -fPIC
 PREFIX?=/usr/local
 
 .PHONY: all clean format install cloc check