Use pkg-config everywhere

.github/workflows/build.yml

@@ -23,7 +23,7 @@ jobs:
         run: |
           sudo apt update
           sudo ACCEPT_EULA=Y apt -y --fix-missing --allow-downgrades upgrade
-          sudo apt -y --allow-downgrades install g++-8-multilib linux-libc-dev binutils-arm-none-eabi p7zip-full
+          sudo apt -y --allow-downgrades install g++-8-multilib linux-libc-dev binutils-arm-none-eabi p7zip-full pkg-config
           sudo dpkg --add-architecture i386
           wget -qO - https://dl.winehq.org/wine-builds/winehq.key | sudo apt-key add -
           sudo add-apt-repository ppa:cybermax-dexter/sdl2-backport

INSTALL.md

@@ -21,6 +21,7 @@ Building the ROM requires the following packages:
 * wine (to run the mwcc executables)
 * python3 (for asm preprocessor)
 * libpng-devel (libpng-dev on Ubuntu)
+* pkg-config
 
 NOTE: If you are using Arch/Manjaro or Void you will only need base-devel instead of build-essentials or make or git. You will still need wine.
 
@@ -48,6 +49,7 @@ You will still require the following packages:
 * git
 * build-essentials
 * libpng-devel
+* pkg-config
 
 Install them using either the Cygwin package manager or using pacman on Msys2.
 

tools/nitrogfx/Makefile

@@ -1,13 +1,8 @@
 CC = gcc
 
-CFLAGS = -Wall -Wextra -Werror -Wno-sign-compare -std=c11 -O2 -DPNG_SKIP_SETJMP_CHECK 
+CFLAGS = -Wall -Wextra -Werror -Wno-sign-compare -std=c11 -O2 -DPNG_SKIP_SETJMP_CHECK $(shell pkg-config --cflags libpng)
 
-UNAME_S := $(shell uname -s)
-ifeq ($(UNAME_S),Darwin)
-CFLAGS += $(shell pkg-config --cflags libpng) $(shell pkg-config --libs libpng)
-endif
-
-LIBS = -lpng -lz
+LIBS = -lpng -lz $(shell pkg-config --libs libpng)
 
 SRCS = main.c convert_png.c gfx.c jasc_pal.c lz.c rl.c util.c font.c huff.c