$ go build -o chatnio
github.com/chai2010/webp
vendor\github.com\chai2010\webp\webp.go:22:9: undefined: webpGetInfo
vendor\github.com\chai2010\webp\webp.go:26:20: undefined: webpDecodeGray
vendor\github.com\chai2010\webp\webp.go:39:20: undefined: webpDecodeRGB
vendor\github.com\chai2010\webp\webp.go:52:20: undefined: webpDecodeRGBA
vendor\github.com\chai2010\webp\webp.go:68:14: undefined: webpDecodeGrayToSize
vendor\github.com\chai2010\webp\webp.go:82:14: undefined: webpDecodeRGBToSize
vendor\github.com\chai2010\webp\webp.go:96:14: undefined: webpDecodeRGBAToSize
vendor\github.com\chai2010\webp\webp.go:109:7: undefined: toGrayImage
vendor\github.com\chai2010\webp\webp.go:110:14: undefined: webpEncodeGray
vendor\github.com\chai2010\webp\webp.go:119:14: undefined: webpEncodeRGB
vendor\github.com\chai2010\webp\webp.go:119:14: too many errors
为什么go build遇到这种问题