From a2cc3dd19a5722db649432ec83059294a1a13879 Mon Sep 17 00:00:00 2001
From: Ian Campbell <ijc@hellion.org.uk>
Date: Sun, 16 Jan 2022 11:10:36 +0000
Subject: [PATCH] Makefile: Specify `pkg-config` via a variable.
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In cross-build situations this allows for `«triplet»-pkg-config` to be passed
in so that target libraries are used instead of host ones.

Unless `PKG_CONFIG` is overridden by the person doing the build then there is
no semantic change.

Signed-off-by: Ian Campbell <ijc@debian.org>
---
 Makefile | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/Makefile b/Makefile
index a4fa649..d4676de 100644
--- a/Makefile
+++ b/Makefile
@@ -36,6 +36,8 @@ endif
 
 DEFAULT_CFLAGS += -Iinclude/
 
+PKG_CONFIG ?= pkg-config
+
 # Tools useful on host and target
 TOOLS = sunxi-fexc sunxi-bootinfo sunxi-fel sunxi-nand-part sunxi-pio
 
@@ -116,12 +118,12 @@ sunxi-fexc: fexc.h script.h script.c \
 	script_fex.h script_fex.c
 
 LIBUSB = libusb-1.0
-LIBUSB_CFLAGS ?= `pkg-config --cflags $(LIBUSB)`
-LIBUSB_LIBS ?= `pkg-config --libs $(LIBUSB)`
+LIBUSB_CFLAGS ?= `$(PKG_CONFIG) --cflags $(LIBUSB)`
+LIBUSB_LIBS ?= `$(PKG_CONFIG) --libs $(LIBUSB)`
 
 ZLIB = zlib
-ZLIB_CFLAGS ?= `pkg-config --cflags $(ZLIB)`
-ZLIB_LIBS ?= `pkg-config --libs $(ZLIB)`
+ZLIB_CFLAGS ?= `$(PKG_CONFIG) --cflags $(ZLIB)`
+ZLIB_LIBS ?= `$(PKG_CONFIG) --libs $(ZLIB)`
 
 ifeq ($(OS),Windows_NT)
 	# Windows lacks mman.h / mmap()