--- klystron/tools/makebundle/Makefile.orig	2021-01-18 11:01:30 UTC
+++ klystron/tools/makebundle/Makefile
@@ -1,4 +1,5 @@
 TARGET = ../bin/makebundle.exe
+CC ?= gcc
 
 ifdef COMSPEC
 SDL = -I /mingw/include/sdl 
@@ -8,4 +9,4 @@ endif
 
 $(TARGET): makebundle.c ../../src/util/bundle.h
 	@mkdir -p ../bin
-	gcc -o $(TARGET) -D_XOPEN_SOURCE makebundle.c -std=c99 -I ../../src $(SDL) -Wall -O3
\ No newline at end of file
+	$(CC) $(CFLAGS) -o $(TARGET) -D_XOPEN_SOURCE makebundle.c -std=c99 -I ../../src $(SDL) -Wall