[PR PATCH] allow to override Makefile OS variable

[svlobanov <svlobanov@users.noreply.github.com>]

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There is a new pull request by svlobanov against master on the mblaze repository

https://github.com/svlobanov/mblaze allow-override-OS
https://github.com/leahneukirchen/mblaze/pull/220

allow to override Makefile OS variable
Overriding OS is useful for cross-compiling if build OS and
target OS are different (e.g. build on MacOS for Linux)

Signed-off-by: Sergey V. Lobanov <sergey@lobanov.in>

A patch file from https://github.com/leahneukirchen/mblaze/pull/220.patch is attached

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From b6bc4f3c748abac693cb0d1e865548949d2b0ff4 Mon Sep 17 00:00:00 2001
From: "Sergey V. Lobanov" <sergey@lobanov.in>
Date: Tue, 11 Jan 2022 13:34:03 +0300
Subject: [PATCH] allow to override Makefile OS variable

Overriding OS is useful for cross-compiling if build OS and
target OS are different (e.g. build on MacOS for Linux)

Signed-off-by: Sergey V. Lobanov <sergey@lobanov.in>
---
 GNUmakefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/GNUmakefile b/GNUmakefile
index 07a0b1a..4ce8fba 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -2,7 +2,7 @@ CFLAGS?=-g -O2 -fstack-protector-strong -D_FORTIFY_SOURCE=2
 override CFLAGS:=-Wall -Wno-switch -Wextra $(CFLAGS)
 LDLIBS=-lrt
 
-OS := $(shell uname)
+OS ?= $(shell uname)
 
 ifeq ($(OS),OpenBSD)
 LOCALBASE=/usr/local