zig: add a zig version check

build.zig

@@ -1,10 +1,31 @@
 const std = @import("std");
 
+const builtin = @import("builtin");
+
 const jsruntime_path = "vendor/jsruntime-lib/";
 const jsruntime = @import("vendor/jsruntime-lib/build.zig");
 const jsruntime_pkgs = jsruntime.packages(jsruntime_path);
 
+const zig_version = builtin.zig_version;
+
+/// Do not rename this constant. It is scanned by some scripts to determine
+/// which zig version to install.
+const recommended_zig_version = jsruntime.recommended_zig_version;
+
 pub fn build(b: *std.build.Builder) !void {
+    switch (comptime zig_version.order(std.SemanticVersion.parse(recommended_zig_version) catch unreachable)) {
+        .eq => {},
+        .lt => {
+            @compileError("The minimum version of Zig required to compile is '" ++ recommended_zig_version ++ "', found '" ++ builtin.zig_version_string ++ "'.");
+        },
+        .gt => {
+            std.debug.print(
+                "WARNING: Recommended Zig version '{s}', but found '{s}', build may fail...\n\n",
+                .{ recommended_zig_version, builtin.zig_version_string },
+            );
+        },
+    }
+
     const target = b.standardTargetOptions(.{});
     const mode = b.standardOptimizeOption(.{});