--- libowfat-0.33.orig/GNUmakefile	2021-04-24 12:47:51.000000000 +0200
+++ libowfat-0.33/GNUmakefile	2024-02-23 05:07:36.527866006 +0100
@@ -23,9 +23,9 @@ picx32 piex32:
 
 CROSS=
 #CROSS=i686-mingw-
-CC?=gcc
-AR?=ar
-RANLIB?=ranlib
+CC=gcc
+AR=ar
+RANLIB=ranlib
 CCC=$(CROSS)$(CC)
 WERROR=
 WARN=-W -Wall -Wextra $(WERROR)
@@ -41,7 +41,8 @@ OPT_PLUS=-O3 $(NATIVE)
 
 DEFINE=-D_REENTRANT
 
-CFLAGS=-pipe $(WARN) $(DEFINE) $(OPT_REG)
+CFLAGS?=
+CFLAGS+=-pipe $(WARN) $(DEFINE) $(OPT_REG)
 CFLAGS_OPT=-pipe $(WARN) $(DEFINE) $(OPT_PLUS)
 
 #CFLAGS=-pipe -Os -march=pentiumpro -mcpu=pentiumpro -fomit-frame-pointer -fschedule-insns2 -Wall