From 16d98738e74f189b3a00c23390ab5a9a22b056a1 Mon Sep 17 00:00:00 2001
From: Paride Legovini <pl@ninthfloor.org>
Date: Thu, 10 Jan 2019 13:36:09 +0100
Subject: [PATCH] Let the user specify CPPFLAGS

This complements the work done in d4928ed, allowing the user to specify
the preprocessor flags with the CPPFLAGS environment variable. This is
useful for example to specify preprocessor macros with -D.

CFLAGS could be used instead, but CPPFLAGS is more correct and is expected
to be honored in some cases. For example, the helper scripts to build
Debian packages make use of CPPFLAGS, but the variable is currently
being ignored unless manually appended to CFLAGS.
---
 config.mk | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/config.mk b/config.mk
index 64a1da9..5059632 100644
--- a/config.mk
+++ b/config.mk
@@ -21,8 +21,8 @@ LIBS = -L$(X11LIB) -lm -lrt -lX11 -lutil -lXft \
        `$(PKG_CONFIG) --libs freetype2`
 
 # flags
-CPPFLAGS = -DVERSION=\"$(VERSION)\" -D_XOPEN_SOURCE=600
-STCFLAGS = $(INCS) $(CPPFLAGS) $(CFLAGS)
+STCPPFLAGS = -DVERSION=\"$(VERSION)\" -D_XOPEN_SOURCE=600
+STCFLAGS = $(INCS) $(STCPPFLAGS) $(CPPFLAGS) $(CFLAGS)
 STLDFLAGS = $(LIBS) $(LDFLAGS)
 
 # OpenBSD: