maintainer-feedback requested: [Bug 251058] graphics/cairo - "GL/gl.h not found"

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Bugzilla Automation <bugzilla at FreeBSD.org> has asked freebsd-desktop (Team)
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Bug 251058: graphics/cairo - "GL/gl.h not found"
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=251058



--- Description ---
I'm building cairo from ports, and the configure script fails. In the config
log attached, it says that it was unable to locate the OpenGL headers.

Specifically, "GL/gl.h"

The GL code I believe has been merged into mesa libs back in 2017, so, I'm not
sure what I could try to resolve. Any pointers for a newb?