This makes Makefile POSIX-compliant by getting rid of non-standard
operators. When there's a need for an user to build project with
values from environment variables, they can pass -e flag to make.
---
 Makefile | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/Makefile b/Makefile
index d4a9da4..1636f09 100644
--- a/Makefile
+++ b/Makefile
@@ -1,12 +1,13 @@
+.POSIX:
 VERSION=1.0.0
-CFLAGS?=-g
-MAINFLAGS:=-DVERSION='"$(VERSION)"' -Wall -Wextra -Werror -Wno-unused-parameter
-LDFLAGS+=-static
-INCLUDE+=-Iinclude
-PREFIX?=/usr/local
-BINDIR?=$(PREFIX)/bin
-MANDIR?=$(PREFIX)/share/man
-PCDIR?=$(PREFIX)/share/pkgconfig
+CFLAGS=-g
+MAINFLAGS=-DVERSION='"$(VERSION)"' -Wall -Wextra -Werror -Wno-unused-parameter
+LDFLAGS=-static
+INCLUDE=-Iinclude
+PREFIX=/usr/local
+BINDIR=$(PREFIX)/bin
+MANDIR=$(PREFIX)/share/man
+PCDIR=$(PREFIX)/share/pkgconfig
 OUTDIR=.build
 .DEFAULT_GOAL=all
 
-- 
2.37.3

On 9/28/22 17:01, Grigory Kirillov wrote:
> This makes Makefile POSIX-compliant by getting rid of non-standard
> operators. When there's a need for an user to build project with
> values from environment variables, they can pass -e flag to make.

I am in fact not entirely sure that this is desirable. I'd be curious: 
what make are you using that you'd need this? I am pretty sure there is 
very little software out there that you could actually build with pure 
POSIX make?

Conrad

On Thu, Sep 29, 2022 at 12:01:16PM +0200, Conrad Hoffmann wrote:
> On 9/28/22 17:01, Grigory Kirillov wrote:
> > This makes Makefile POSIX-compliant by getting rid of non-standard
> > operators. When there's a need for an user to build project with
> > values from environment variables, they can pass -e flag to make.
> 
> I am in fact not entirely sure that this is desirable. I'd be curious: what
> make are you using that you'd need this? I am pretty sure there is very
> little software out there that you could actually build with pure POSIX
> make?
> 
> Conrad

I don't think this is the only true way to organize a Makefile,
I just thought it worth mentioning that the Makefile used in scd2html
is fairly easy to make POSIX-compliant (as far as I know, in some BSDs'
environments they prefer to use built-in make, which doesn't support
some GNU extensions; however, in most cases GNU make is available). It
was also a good opportunity for me to try email-based patch workflow :^)
Feel free to ignore this proposal