Fix build on linux

Makefile

@@ -13,6 +13,8 @@ ifeq ($(OS),Windows_NT)     # is Windows_NT on XP, 2000, 7, Vista, 10...
 else
 	LIBRARIES=-lX11 -lGL -lpthread -lpng -lasound
 	EXECUTABLE=awoorwae
+	CC=gcc
+	CPP=g++
 endif
 SOURCES=$(wildcard src/*.c)
 SOURCES_CPP=$(wildcard src/*.cpp)
@@ -36,4 +38,4 @@ debug: $(EXECUTABLE)
 	gdb $(EXECUTABLE)
 
 run: $(EXECUTABLE)
-	./$(EXECUTABLE)
+	./$(EXECUTABLE)