While it works fine when building directly the port poudriere complains :
[00:00:06] Warning: (graphics/libdrm): Error: graphics/libdrm has dependency on textproc/py-docutils with invalid empty FLAVOR; Please contact maintainer of the port to fix this.
portlint suggested this but this seems wrong.
Fixes: 67c3a731efe7 ("graphics/libdrm: Always enable manpages")
Sponsored by: Beckhoff Automation GmbH & Co. KG
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