--- a/Makefile	2019-10-03 23:02:15.000000000 +0200
+++ b/Makefile	2019-10-15 08:31:49.541999473 +0200
@@ -14,8 +14,8 @@
 #CFLAGS = -O2 -Wall -std=gnu89 -pedantic -Wextra -Wformat-security -D_FORTIFY_SOURCE=1 -Weverything -Wno-padded
 
 # production
-CC = gcc
-CFLAGS = -O2 -std=gnu89
+CC ?= gcc
+CFLAGS ?= -O2 -std=gnu89
 
 all: ethflopd