diff -up grubby-8.40-1/Makefile.orig2 grubby-8.40-1/Makefile
--- grubby-8.40-1/Makefile.orig2	2023-04-14 22:13:21.745311816 +0800
+++ grubby-8.40-1/Makefile	2023-04-14 22:14:02.729398198 +0800
@@ -22,7 +22,7 @@ VERSION=8.40
 TARGETS = grubby
 OBJECTS = grubby.o log.o
 
-CC = gcc
+CC ?= gcc
 RPM_OPT_FLAGS ?= -O2 -g -pipe -Wp,-D_FORTIFY_SOURCE=2 -fstack-protector
 CFLAGS += $(RPM_OPT_FLAGS) -std=gnu99 -Wall -Werror -Wno-error=unused-function -Wno-unused-function -ggdb
 LDFLAGS := $(RPM_LD_FLAGS)