From 6ece4e99f052e01d649a06817c7b5a92ee4f5ba0 Mon Sep 17 00:00:00 2001
From: Jesse Rudolph <jesse.rudolph@gmail.com>
Date: Sun, 24 May 2020 06:04:21 -0500
Subject: [PATCH] add argument to Pkg().link to enable linking to system raylib

---
 build.zig | 6 ++++--
 lib.zig   | 9 ++++++++-
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/build.zig b/build.zig
index 0ada318..aa7a60a 100755
--- a/build.zig
+++ b/build.zig
@@ -58,13 +58,15 @@ pub fn build(b: *Builder) void {
     };
 
     const examples_step = b.step("examples", "Builds all the examples");
+    const system_lib = b.option(bool, "system-raylib", "link to preinstalled raylib libraries") orelse false;
 
     for (examples) |ex| {
         const exe = b.addExecutable(ex.name, ex.path);
+
         exe.setBuildMode(mode);
         exe.setTarget(target);
 
-        raylib.link(exe);
+        raylib.link(exe, system_lib);
         raylib.addAsPackage("raylib", exe);
         raylib.math.addAsPackage("raylib-math", exe);
 
@@ -73,4 +75,4 @@ pub fn build(b: *Builder) void {
         run_step.dependOn(&run_cmd.step);
         examples_step.dependOn(&exe.step);
     }
-}
\ No newline at end of file
+}
diff --git a/lib.zig b/lib.zig
index 2fdfb89..edecbb8 100644
--- a/lib.zig
+++ b/lib.zig
@@ -4,12 +4,13 @@ const LibExeObjStep = std.build.LibExeObjStep;
 
 pub fn Pkg(pkgdir: comptime []const u8) type {
     return struct {
-        pub fn link(exe: *LibExeObjStep) void {
+        pub fn link(exe: *LibExeObjStep, system_lib: bool) void {
             const raylibFlags = &[_][]const u8{
                 "-std=c99",
                 "-DPLATFORM_DESKTOP",
                 "-D_POSIX_C_SOURCE",
             };
+
             if (exe.target.toTarget().os.tag == .windows) {
                 exe.linkSystemLibrary("winmm");
                 exe.linkSystemLibrary("gdi32");
@@ -19,6 +20,11 @@ pub fn Pkg(pkgdir: comptime []const u8) type {
             }
             exe.linkLibC();
 
+            if (system_lib) {
+                exe.linkSystemLibrary("raylib");
+                return;
+            }
+
             exe.addSystemIncludeDir(pkgdir ++ "/raylib/src");
             exe.addSystemIncludeDir(pkgdir ++ "/raylib/src/external/glfw/include");
             exe.addCSourceFile(pkgdir ++ "/raylib/src/core.c", raylibFlags);
@@ -30,6 +36,7 @@ pub fn Pkg(pkgdir: comptime []const u8) type {
             exe.addCSourceFile(pkgdir ++ "/raylib/src/textures.c", raylibFlags);
             exe.addCSourceFile(pkgdir ++ "/raylib/src/utils.c", raylibFlags);
         }
+
         pub fn addAsPackage(name: comptime []const u8, to: *LibExeObjStep) void {
             to.addPackagePath(name, pkgdir ++ "/lib/raylib-zig.zig");
         }