pkg/macos: start core foundation bindings

pkg/macos/build.zig

@@ -0,0 +1,24 @@
+const std = @import("std");
+const builtin = @import("builtin");
+
+pub const pkg = std.build.Pkg{
+    .name = "macos",
+    .source = .{ .path = thisDir() ++ "/main.zig" },
+};
+
+fn thisDir() []const u8 {
+    return std.fs.path.dirname(@src().file) orelse ".";
+}
+
+pub const Options = struct {};
+
+pub fn link(
+    b: *std.build.Builder,
+    step: *std.build.LibExeObjStep,
+    opt: Options,
+) !*std.build.LibExeObjStep {
+    _ = opt;
+    const lib = b.addStaticLibrary("macos", null);
+    step.linkFramework("CoreFoundation");
+    return lib;
+}