Use the cmake_prefix instead

Author: Wartori54

.github/workflows/build-libs.yml

@@ -284,7 +284,7 @@ jobs:
       if: ${{ matrix.platform == 'linux' }}
       working-directory: source/FMOD_SDL_HEADERS
       run: |
-        make -e SDL2_INCLUDE=../SDL2/include/ SDL2_LIB=../SDL2/build/
+        make -e SDL2_PREFIX=${{ env.SDL2_DIR }}
 
 
     # FNA (Only built on Linux, due to being platform agnostic)

source/FMOD_SDL_HEADERS/Makefile

@@ -1,13 +1,12 @@
 .PHONY: all stub
 
 FMOD_VERSION = 10
-SDL2_INCLUDE = /usr/include/SDL2
-SDL2_LIB = /usr/lib
+SDL2_PREFIX = ""
 
 all: stub
 	cp ../FMOD_SDL/FMOD_SDL.c .
 # Copied from FMOD_SDL's makefile, altered slightly in order to be nicer with CI
-	$(CC) -O3 -Wall -pedantic -fpic -fPIC -shared -o libfmod_SDL.so FMOD_SDL.c -D_REENTRANT -I$(SDL2_INCLUDE) -L$(SDL2_LIB) -lSDL2 libfmod.so.$(FMOD_VERSION)
+	$(CC) -O3 -Wall -pedantic -fpic -fPIC -shared -o libfmod_SDL.so FMOD_SDL.c `$(SDL2_PREFIX)/bin/sdl2-config --libs --cflags` libfmod.so.$(FMOD_VERSION)
 
 stub:
 	$(CC) -fPIC -shared -o libfmod.so.10 fmod_stub.c