[proaudio] jack-audio-connection-kit error with EAPI=5

[Xavier Miller <xavier.miller@xxxxxxxxx>]

>>> Emerging (3 of 6)
>>> media-sound/jack-audio-connection-kit-1.9.9.5-r2::proaudio
 * jack-1.9.9.5.tar.bz2 SHA256 SHA512 WHIRLPOOL
size ;-) ...
[ ok ]
>>> Unpacking source...
>>> Unpacking jack-1.9.9.5.tar.bz2
>>> to /var/tmp/portage/media-sound/jack-audio-connection-kit-1.9.9.5-r2/work
>>> Source unpacked
>>> in /var/tmp/portage/media-sound/jack-audio-connection-kit-1.9.9.5-r2/work
>>> Preparing source
>>> in /var/tmp/portage/media-sound/jack-audio-connection-kit-1.9.9.5-r2/work/jack-1.9.9.5 ...
 * ERROR: media-sound/jack-audio-connection-kit-1.9.9.5-r2::proaudio
failed (prepare phase):
 *   default_src_prepare() is not supported in EAPI='5' in phase
src_prepare
 * 
 * Call stack:
 *            ebuild.sh, line   93:  Called src_prepare
 *          environment, line 3312:  Called default
 *   phase-functions.sh, line  770:  Called default_src_prepare
 *   phase-functions.sh, line  763:  Called die
 * The specific snippet of code:
 *      done
 * 
 * If you need support, post the output of `emerge --info
'=media-sound/jack-audio-connection-kit-1.9.9.5-r2::proaudio'`,
 * the complete build log and the output of `emerge -pqv
'=media-sound/jack-audio-connection-kit-1.9.9.5-r2::proaudio'`.
 * The complete build log is located at
'/var/tmp/portage/media-sound/jack-audio-connection-kit-1.9.9.5-r2/temp/build.log'.
 * The ebuild environment file is located at
'/var/tmp/portage/media-sound/jack-audio-connection-kit-1.9.9.5-r2/temp/environment'.
 * Working directory:
'/var/tmp/portage/media-sound/jack-audio-connection-kit-1.9.9.5-r2/work/jack-1.9.9.5'
 * S:
   '/var/tmp/portage/media-sound/jack-audio-connection-kit-1.9.9.5-r2/work/jack-1.9.9.5'