conditionally applying a patch

To: tech-pkg%netbsd.org@localhost
Subject: conditionally applying a patch
From: Edgar Fuß <ef%math.uni-bonn.de@localhost>
Date: Tue, 24 May 2016 18:08:33 +0200

Is there a method to apply a patch conditionally, say, depending on an option?

I would like to add an option to www/lighttpd to make the use of TCP Accept Filters optional. There's no configure switch for that, it's simply governed by #ifdef SO_ACCEPTFILTER.
I'm not keen to add an autohell option for it myself.
I could change that to #ifdef SO_ACCEPTFILTER && USE_ACCEPTFILTER and set CFLAGS conditionally.
But I could also simply (conditionally) patch away that code.

Is there Prior Art for something like this?

Follow-Ups:
- Re: conditionally applying a patch
  - From: Joerg Sonnenberger

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