Old story of our patches not working with the latest grep version. Unfortunately the obvious fix (rebuilding autotools) will fail because wiretap tries to use AM_PATH_GLIB that is part of the glib 1.2 macros and it doesn't ship it. I'd suggest getting it fixed upstream by dropping glib 1.2 support altogether, anyway this needs a bit more work than a simple eautoreconf.
Created attachment 258105 [details] Build log
should be all set now in the tree; thanks for the report! Commit message: Update old grep style which fails with newer versions http://sources.gentoo.org/net-wireless/wifiscanner/wifiscanner-1.0.1-r2.ebuild?r1=1.2&r2=1.3
