openbor: Fails to build on Manjaro x64

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Description

Fails to build on Manjaro x64 and can’t find SDL2 even tho it is installed

./build.sh 4 amd64                 ✔ 
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OpenBOR v3.0 Build 7142 (commit hash 7f6f175) - http://www.ChronoCrash.com

All rights reserved.
See LICENSE and README within OpenBOR root for details.

Copyright (c) 2004 - 2018 OpenBOR Team
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   Linux amd64 SDK (x86_64-pc-linux-gnu) Environment Loaded!
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Removing All LINUX Files...
Done!

Compiling LINUX Port: openbor.c...
Compiling LINUX Port: openborscript.c...
Compiling LINUX Port: sdl/control.c...
Compiling LINUX Port: sdl/sblaster.c...
/bin/sh: line 1: pkg-config: command not found
/bin/sh: line 1: pkg-config: command not found
/bin/sh: line 1: pkg-config: command not found
/bin/sh: line 1: pkg-config: command not found
In file included from openbor.h:23,
                 from openbor.c:14:
sdl/video.h:15:10: fatal error: SDL.h: No such file or directory
   15 | #include "SDL.h"
      |          ^~~~~~~
compilation terminated.
In file included from sdl/sblaster.c:13:
sdl/sdlport.h:12:10: fatal error: SDL.h: No such file or directory
   12 | #include <SDL.h>
      |          ^~~~~~~
compilation terminated.
make: *** [Makefile:713: sdl/sblaster.o] Error 1
make: *** Waiting for unfinished jobs....
make: *** [Makefile:713: openbor.o] Error 1
In file included from source/globals.h:41,
                 from source/scriptlib/depends.h:13,
                 from source/scriptlib/Interpreter.h:11,
                 from source/openborscript/config.h:12,
                 from openborscript.c:30:
sdl/sdlport.h:12:10: fatal error: SDL.h: No such file or directory
   12 | #include <SDL.h>
      |          ^~~~~~~
In file included from source/globals.h:41,
                 from sdl/control.c:14:
sdl/sdlport.h:12:10: fatal error: SDL.h: No such file or directory
   12 | #include <SDL.h>
      |          ^~~~~~~
compilation terminated.
compilation terminated.
make: *** [Makefile:713: sdl/control.o] Error 1
make: *** [Makefile:713: openborscript.o] Error 1

Removing All LINUX Files...
Done!

Expected behavior

Builds and finds dependancies

• Platform OpenBOR v3.0 Build 6391