diff --git a/UnixBench/Makefile b/UnixBench/Makefile
index 4874d1f..439c53c 100644
--- a/UnixBench/Makefile
+++ b/UnixBench/Makefile
@@ -55,7 +55,7 @@ GL_LIBS = -lGL -lXext -lX11
 # COMPILER CONFIGURATION: Set "CC" to the name of the compiler to use
 # to build the binary benchmarks.  You should also set "$cCompiler" in the
 # Run script to the name of the compiler you want to test.
-CC=gcc
+CC?=gcc
 
 # OPTIMISATION SETTINGS:
 # Use gcc option if defined UB_GCC_OPTIONS via "Environment variable" or "Command-line arguments".