--- gentoo/media-sound/audacity/audacity-2.3.2.ebuild	2019-08-28 04:09:53.000000000 -0400
+++ local/media-sound/audacity/audacity-2.3.2.ebuild	2019-09-11 22:23:17.382821834 -0400
@@ -52,6 +52,7 @@
 DEPEND="${RDEPEND}"
 BDEPEND="virtual/pkgconfig
 	nls? ( sys-devel/gettext )
+	!portmixer? ( sys-devel/automake:1.15 )
 "
 
 S="${WORKDIR}/${PN}-${MY_P}"
@@ -59,6 +60,7 @@
 PATCHES=(
 	"${FILESDIR}"/${PN}-2.3.2-fix_building_against_system_portaudio.patch
 	"${FILESDIR}"/${PN}-2.3.2-Fix-building-without-midi.patch
+	"${FILESDIR}"/${PN}-2.3.2-fix-build-without-portmixer.patch
 )
 
 src_prepare() {
@@ -67,6 +69,11 @@
 	use midi || sed -i \
 		-e 's:^\(#define EXPERIMENTAL_MIDI_OUT\):// \1:' \
 		src/Experimental.h || die
+	if ! use portmixer ; then
+		# calling eautoreconf takes ages and is overkill
+		aclocal-1.15 -I m4/ || die
+		automake-1.15 lib-src/Makefile || die
+	fi
 }
 
 src_configure() {