diff '--color=auto' -u -r -N my_basic-git/makefile my_basic-git-makefile/makefile
--- my_basic-git/makefile	2022-08-25 17:22:17.043773022 +0200
+++ my_basic-git-makefile/makefile	2022-08-25 17:25:35.292744445 +0200
@@ -1,3 +1,5 @@
+CFLAGS=-Os
+
 OS := $(shell uname -s)
 IS_APPLE := $(shell echo $(OS)|grep -i darwin)
 
@@ -9,20 +11,20 @@
 my_basic_arm_app.o: my_basic_arm.o main_arm.o
 	cc -o my_basic_arm_app.o my_basic_arm.o main_arm.o -target arm64-apple-macos11
 my_basic_x86.o: core/my_basic.c core/my_basic.h
-	cc -Os -c core/my_basic.c -Wno-multichar -Wno-overflow -Wno-unused-result -o my_basic_x86.o -target x86_64-apple-macos10.12
+	cc $(CFLAGS) -c core/my_basic.c -Wno-multichar -Wno-overflow -Wno-unused-result -o my_basic_x86.o -target x86_64-apple-macos10.12
 main_x86.o: shell/main.c core/my_basic.h
-	cc -Os -c shell/main.c -Wno-unused-result -o main_x86.o -target x86_64-apple-macos10.12
+	cc $(CFLAGS) -c shell/main.c -Wno-unused-result -o main_x86.o -target x86_64-apple-macos10.12
 my_basic_arm.o: core/my_basic.c core/my_basic.h
-	cc -Os -c core/my_basic.c -Wno-multichar -Wno-overflow -Wno-unused-result -o my_basic_arm.o -target arm64-apple-macos11
+	cc $(CFLAGS) -c core/my_basic.c -Wno-multichar -Wno-overflow -Wno-unused-result -o my_basic_arm.o -target arm64-apple-macos11
 main_arm.o: shell/main.c core/my_basic.h
-	cc -Os -c shell/main.c -Wno-unused-result -o main_arm.o -target arm64-apple-macos11
+	cc $(CFLAGS) -c shell/main.c -Wno-unused-result -o main_arm.o -target arm64-apple-macos11
 else
 my_basic: my_basic.o main.o
 	cc -o output/my_basic my_basic.o main.o -lm -lrt
 my_basic.o: core/my_basic.c core/my_basic.h
-	cc -Os -c core/my_basic.c -Wno-multichar -Wno-overflow -Wno-unused-result
+	cc $(CFLAGS) -c core/my_basic.c -Wno-multichar -Wno-overflow -Wno-unused-result
 main.o: shell/main.c core/my_basic.h
-	cc -Os -c shell/main.c -Wno-unused-result
+	cc $(CFLAGS) -c shell/main.c -Wno-unused-result
 endif
 
 clean: