Fix being unusable as library

build.zig

@@ -4,39 +4,36 @@ pub fn build(b: *std.Build) !void {
     const target = b.standardTargetOptions(.{});
     const optimize = b.standardOptimizeOption(.{});
 
-    _ = b.addModule("flecs-zig-ble", .{
+    const module = b.addModule("flecs-zig-ble", .{
         .root_source_file = .{ .path = "src/main.zig" },
     });
+    module.addIncludePath(.{ .path = "libs/flecs" });
 
     const lib = b.addStaticLibrary(.{
         .name = "flecs-zig-ble",
-        .root_source_file = .{ .path = "src/main.zig" },
         .target = target,
         .optimize = optimize,
     });
-    setupFlecs(lib);
+
-    lib.installHeader("libs/flecs/flecs.h", "flecs.h");
+    lib.linkLibC();
+    lib.addCSourceFile(.{
+        .file = .{ .path = "libs/flecs/flecs.c" },
+        .flags = &.{"-fno-sanitize=undefined"},
+    });
     b.installArtifact(lib);
 
+    if (lib.rootModuleTarget().os.tag == .windows) {
+        lib.linkSystemLibrary("ws2_32");
+    }
+
     const main_tests = b.addTest(.{
         .root_source_file = .{ .path = "src/main.zig" },
         .target = target,
         .optimize = optimize,
     });
-    setupFlecs(main_tests);
+    main_tests.linkLibrary(lib);
+    main_tests.addIncludePath(.{ .path = "libs/flecs" });
     const run_main_tests = b.addRunArtifact(main_tests);
     const test_step = b.step("test", "Run library tests");
     test_step.dependOn(&run_main_tests.step);
 }
-
-fn setupFlecs(step: *std.Build.Step.Compile) void {
-    step.linkLibC();
-    step.addIncludePath(.{ .path = "libs/flecs" });
-    step.addCSourceFile(.{
-        .file = .{ .path = "libs/flecs/flecs.c" },
-        .flags = &.{"-fno-sanitize=undefined"},
-    });
-    if (step.rootModuleTarget().os.tag == .windows) {
-        step.linkSystemLibrary("ws2_32");
-    }
-}