错误：需要支持FreeType的GD PHP扩展或支持PNG的ImageMagick PHP扩展

I'm on MacOS Mojave with Apache. I'm getting following error on a fresh yii 2 install on contact page

Invalid Configuration – yii\base\InvalidConfigException Either GD PHP extension with FreeType support or ImageMagick PHP extension with PNG support is required

I've gd enabled with PNG support. I've php7

What else I need to do to fix this error?

The simplest solution is probably to install ImageMagick. See ImageMagick Brew installation with PHP Module in Mac OS X for details.