[sleepy.penguin] [PATCH] extconf: avoid unnecessary linkage against libkqueue

[Eric Wong <normalperson@yhbt.net>]

The check for libkqueue may succeed out-of-the-box on Debian systems
where libkqueue-dev is installed.  However, libkqueue-dev on Debian
installs sys/event.h in a non-standard include path
(/usr/include/kqueue), so it is not picked up by default and
kqueue support is never compiled.

So only check for (and link to) libkqueue if we are configured
to detect sys/event.h.  This should not affect users on *BSD
platforms with native kqueue support.
---
 ext/sleepy_penguin/extconf.rb | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/ext/sleepy_penguin/extconf.rb b/ext/sleepy_penguin/extconf.rb
index 3a6152b..407c947 100644
--- a/ext/sleepy_penguin/extconf.rb
+++ b/ext/sleepy_penguin/extconf.rb
@@ -1,8 +1,9 @@
 require 'mkmf'
 have_header('sys/epoll.h')
 dir_config('kqueue')
-have_library('kqueue')
-have_header('sys/event.h')
+if have_header('sys/event.h')
+  have_library('kqueue')
+end
 have_header('sys/mount.h')
 have_header('sys/eventfd.h')
 
-- 
EW