engine.build.lua: export settings.

engine.build.lua

@@ -185,3 +185,21 @@ libspectre = StaticLibrary(settings,
 	obj,
 	ft2_obj
 )
+
+-- Export settings
+-----------------------------------------------------------
+local exp = NewSettings()
+
+-- Headers
+exp.cc.includes:Add(RelPath("include"))
+
+-- Additional libraries.
+if TARGET_OS == "Win32" then
+	-- Windows needs to link against these.
+	exp.link.libs:Add("opengl32", "gdi32", "user32")
+elseif TARGET_OS == "Unix" then
+	-- Unix nees dl and X11 libs and freetype
+	exp.link.libs:Add("dl", 'X11', 'Xrandr', 'freetype')
+end
+
+libspectre_settings = exp