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This repo contains code for your build.zig that can statically compile zlib, as well as some idiomatic Zig bindings for zlib that you can use in your application. In either case below you will be able to include zlibs header with:

const c = @cImport({
    @cInclude("zlib.h");
});

In order to statically link zlib into your application and access the bindings with a configurable import string:

const zlib = @import("path/to/zlib.zig");

pub fn build(b: *std.build.Builder) void {
    // ...

    const lib = zlib.create(b, target, mode);

    const exe = b.addExecutable("my-program", "src/main.zig");
    lib.link(exe, .{ .import_name = "zlib" });
}

Now code that is part of the my-program executable can import the zlib bindings with @import("zlib").

In order to just link to the application, all you need to do is omit the .import_name = "zlib" argument to zlib's link options:

    lib.link(exe, .{});