From: Simon McVittie <smcv@debian.org>
Date: Wed, 17 Sep 2025 11:09:14 +0100
Subject: build: Don't hard-code a specific pkg-config executable

When cross-compiling we'll need to use a pkgconf or pkg-config suitable
for the host architecture, for example aarch64-linux-gnu-pkgconf.
OS distributions typically expect to do this by setting the environment
variable PKG_CONFIG, as used in Autotools.

Signed-off-by: Simon McVittie <smcv@debian.org>
Forwarded: https://github.com/yquake2/yquake2/pull/1250
---
 Makefile | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index 1703dc0..c16c946 100644
--- a/Makefile
+++ b/Makefile
@@ -141,6 +141,9 @@ ifdef UBSAN
 DEBUG=1
 endif
 
+# Used to detect SDL, needs to be overridable for cross-compilation
+PKG_CONFIG ?= pkgconf
+
 # ----------
 
 # Base CFLAGS. These may be overridden by the environment.
@@ -284,7 +287,7 @@ endif
 
 # Extra CFLAGS for SDL.
 ifeq ($(WITH_SDL3),yes)
-SDLCFLAGS := $(shell pkgconf --cflags sdl3)
+SDLCFLAGS := $(shell $(PKG_CONFIG) --cflags sdl3)
 SDLCFLAGS += -DUSE_SDL3
 else
 SDLCFLAGS := $(shell sdl2-config --cflags)
@@ -377,7 +380,7 @@ ifeq ($(WITH_SDL3),yes)
 ifeq ($(YQ2_OSTYPE), Darwin)
 SDLLDFLAGS := -lSDL3
 else
-SDLLDFLAGS := $(shell pkgconf --libs sdl3)
+SDLLDFLAGS := $(shell $(PKG_CONFIG) --libs sdl3)
 endif
 else
 ifeq ($(YQ2_OSTYPE), Darwin)