maintainer-feedback requested: [Bug 297072] www/qt5-webengine: fails to link with "unable to find library -levent" — unbundled libevent.gn missing lib_dirs

[bugzilla-noreply at freebsd.org]

Bugzilla Automation <bugzilla at FreeBSD.org> has asked freebsd-kde (group)
<kde at FreeBSD.org> for maintainer-feedback:
Bug 297072: www/qt5-webengine: fails to link with "unable to find library
-levent" — unbundled libevent.gn missing lib_dirs
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=297072



--- Description ---
www/qt5-webengine fails to build under poudriere on FreeBSD 15.1-STABLE with:

    FAILED: [code=1] host/character_data_generator
    ld.lld: error: unable to find library -levent
    c++: error: linker command failed with exit code 1

  The system libevent LIB_DEPENDS is present and correctly resolved
  (libevent.so exists in the jail), but the linker invocation for this
  target has no -L flag pointing at /usr/local/lib at all, so it can't
  find the port's libevent.

  Root cause: build/linux/unbundle/libevent.gn (the stub used when the
  port unbundles libevent via replace_gn_files.py) sets:

    libs = [ "event" ]

  with no corresponding lib_dirs, so nothing tells the linker where to
  look for -levent. Every other unbundled system library appears to
  either use pkg_config() (which supplies -L automatically) or already
  has lib_dirs set; this one stub was missing it.

  Fix: add lib_dirs = [ "/usr/local/lib" ] to that source_set. Patch
  attached and confirmed to build successfully all the way through
  under poudriere, and the resulting package works correctly as a
  dependency for audio/musescore3 (tested: launches, note entry, audio
  playback all functional).