1 files changed, 2 insertions, 2 deletions

diff --git a/Makefile b/Makefile
index 04ab040..37ee948 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 NAME=bb
 PREFIX=
-CC=gcc
-O=-O2
+CC ?= gcc
+O ?= -O2
 CFLAGS=-std=c99 -D_XOPEN_SOURCE=500 -D_GNU_SOURCE -D_POSIX_C_SOURCE=200809L
 CWARN=-Wall -Wpedantic -Wextra -Wno-unknown-pragmas -Wno-missing-field-initializers\
 	  -Wno-padded -Wsign-conversion -Wno-missing-noreturn -Wno-cast-qual -Wtype-limits