--- jfbuild/Makefile.shared.orig	2024-02-19 08:23:00 UTC
+++ jfbuild/Makefile.shared
@@ -3,8 +3,12 @@ EDITORLIB=libbuild.a
 ENGINELIB=libengine.a
 EDITORLIB=libbuild.a
 
-SDL2CONFIG?=$(shell which sdl2-config || which false)
-PKGCONFIG?=$(shell which pkg-config || which false)
+ifndef SDL2CONFIG
+SDL2CONFIG!=which sdl2-config || which false
+endif
+ifndef PKGCONFIG
+PKGCONFIG!=which pkg-config || which false
+endif
 export SDL2CONFIG PKGCONFIG
 
 BUILDCFLAGS=