forcely disable cgo

tools/build/go.go

@@ -15,7 +15,7 @@ func buildV2Ray(targetFile string, version string, goOS GoOS, goArch GoArch) err
 		ldFlags = ldFlags + " -X v2ray.com/core.version=" + version + " -X v2ray.com/core.build=" + today
 	}
 	cmd := exec.Command("go", "build", "-tags", "json", "-o", targetFile, "-compiler", "gc", "-ldflags", ldFlags, "v2ray.com/core/main")
-	cmd.Env = append(cmd.Env, "GOOS="+string(goOS), "GOARCH="+string(goArch))
+	cmd.Env = append(cmd.Env, "GOOS="+string(goOS), "GOARCH="+string(goArch), "CGO_ENABLED=0")
 	cmd.Env = append(cmd.Env, os.Environ()...)
 	output, err := cmd.CombinedOutput()
 	if len(output) > 0 {