"Makefile warnings, please consider fixing"

[gutiersa]

I keep getting errors like this but I am not sure how to fix them. I have looked around but I am no finding anything related to my particular issue. This error occurred during the install of twig. It did install, but I would like to fix it. Thanks

/!\ php74-pear-channel-twig-20140108: Makefile warnings, please consider fixing /!\

 

[Alexander88207]

The license was not set for this port.

$ make install
/!\ php72-pear-channel-twig-20140108: Makefile warnings, please consider fixing /!\

Please set LICENSE for this port

 

[gutiersa]

How do I set license for this port? I am not sure how to do that.
Thank you

 

[Alexander88207]

This kind of port have no license file so its impossible to set one.

 

[eldaemon]

Seems like the warning shouldn't come up (or be different) on those types of ports. I guess it's a meta-port?