no required module provides package 报错：
PS E:gogo-webkit-master> go run example/webview.go examplewebview.go:5:2: no required module provides package github.com/mattn/go-gtk/gtk: go.mod file not found in current directory or any parent directory; see 'go help modules'
执行：
go env -w GO111MODULE=auto go mod init example go get xxxx 缺失的mod
之后在运行go程序即可
go run example/webview.go
若中间出现：
PS E:gogo-webkit-master> go get github.com/mattn/go-webkit/webkit
# pkg-config --cflags -- pango
pkg-config: exec: "pkg-config": executable file not found in %PATH%
# pkg-config --cflags -- glib-2.0 gobject-2.0
pkg-config: exec: "pkg-config": executable file not found in %PATH%
参看：windows安装pkg-config - 情三 - 博客园
