media-plugins/alsa-plugins: respect EPREFIX, bug #673464

Sammy Pfeiffer discovered and provided a fix for alsa-plugins
where from version 1.1.7 new option got a default without $(prefix):
                --with-alsalconfdir=/etc/alsa/conf.d

The fix is to add a prefix:
    --with-alsalconfdir="${EPREFIX}"/etc/alsa/conf.d

Reported-by: Sammy Pfeiffer
Closes: https://bugs.gentoo.org/673464
Package-Manager: Portage-2.3.64, Repoman-2.3.12
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>

media-plugins/alsa-plugins/alsa-plugins-1.1.8-r1.ebuild

@@ -0,0 +1,101 @@
+# Copyright 1999-2019 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+inherit autotools flag-o-matic multilib multilib-minimal
+
+DESCRIPTION="ALSA extra plugins"
+HOMEPAGE="http://www.alsa-project.org/"
+SRC_URI="mirror://alsaproject/plugins/${P}.tar.bz2"
+
+LICENSE="GPL-2 LGPL-2.1"
+SLOT="0"
+KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~ppc ~ppc64 ~sh ~sparc ~x86 ~amd64-linux"
+IUSE="arcam_av debug ffmpeg jack libav libsamplerate +mix oss pulseaudio speex +usb_stream"
+
+RDEPEND="
+	>=media-libs/alsa-lib-${PV}:=[${MULTILIB_USEDEP}]
+	ffmpeg? (
+		libav? ( media-video/libav:= )
+		!libav? ( media-video/ffmpeg:0= )
+	)
+	jack? ( virtual/jack[${MULTILIB_USEDEP}] )
+	libsamplerate? ( >=media-libs/libsamplerate-0.1.8-r1:=[${MULTILIB_USEDEP}] )
+	pulseaudio? ( >=media-sound/pulseaudio-2.1-r1[${MULTILIB_USEDEP}] )
+	speex? (
+		>=media-libs/speex-1.2.0:=[${MULTILIB_USEDEP}]
+		media-libs/speexdsp[${MULTILIB_USEDEP}]
+	)
+"
+DEPEND="${RDEPEND}"
+BDEPEND="virtual/pkgconfig"
+
+src_prepare() {
+	default
+
+	# For some reasons the polyp/pulse plugin does fail with alsaplayer with a
+	# failed assert. As the code works just fine with asserts disabled, for now
+	# disable them waiting for a better solution.
+	sed -i \
+		-e '/AM_CFLAGS/s:-Wall:-DNDEBUG -Wall:' \
+		pulse/Makefile.am || die
+
+	eautoreconf
+}
+
+multilib_src_configure() {
+	use debug || append-cppflags -DNDEBUG
+
+	local myeconfargs=(
+		# default does not contain $prefix: bug #673464
+		--with-alsalconfdir="${EPREFIX}"/etc/alsa/conf.d
+
+		--with-speex="$(usex speex lib no)"
+		$(use_enable arcam_av arcamav)
+		$(use_enable ffmpeg libav)
+		$(use_enable jack)
+		$(use_enable libsamplerate samplerate)
+		$(use_enable mix)
+		$(use_enable oss)
+		$(use_enable pulseaudio)
+		$(use_enable speex speexdsp)
+		$(use_enable usb_stream usbstream)
+	)
+	ECONF_SOURCE="${S}" econf "${myeconfargs[@]}"
+}
+
+multilib_src_install_all() {
+	einstalldocs
+
+	cd doc || die
+	dodoc upmix.txt vdownmix.txt README-pcm-oss
+	use jack && dodoc README-jack
+	use libsamplerate && dodoc samplerate.txt
+	use ffmpeg && dodoc lavrate.txt a52.txt
+
+	if use pulseaudio; then
+		dodoc README-pulse
+		# install ALSA configuration files
+		# making PA to be used by alsa clients
+		insinto /usr/share/alsa
+		doins "${FILESDIR}"/pulse-default.conf
+		insinto /usr/share/alsa/alsa.conf.d
+		doins "${FILESDIR}"/51-pulseaudio-probe.conf
+		# bug #410261, comment 5+
+		# seems to work fine without any path
+		sed -i \
+			-e "s:/usr/lib/alsa-lib/::" \
+			"${ED%/}"/usr/share/alsa/alsa.conf.d/51-pulseaudio-probe.conf || die #410261
+	fi
+
+	find "${ED}" \( -name '*.a' -o -name '*.la' \) -delete || die
+}
+
+pkg_postinst() {
+	if use pulseaudio; then
+		einfo "The PulseAudio device is now set as the default device if the"
+		einfo "PulseAudio server is found to be running. Any custom"
+		einfo "configuration in /etc/asound.conf or ~/.asoundrc for this"
+		einfo "purpose should now be unnecessary."
+	fi
+}