https://bugs.gentoo.org/785232
https://bugs.gentoo.org/921214
https://github.com/mate-desktop/libmatemixer/pull/37
https://github.com/mate-desktop/libmatemixer/commit/cb9e62b6d101cb42cdcf3ec7617616e6c4a4bb35

From cb9e62b6d101cb42cdcf3ec7617616e6c4a4bb35 Mon Sep 17 00:00:00 2001
From: orbea <orbea@riseup.net>
Date: Thu, 12 May 2022 18:34:52 -0700
Subject: [PATCH] backends: Add missing dependencies

When building the backends with slibtool they will fail with undefined
references to libmatemixer.la. This is because they use -no-undefined
which slibtool explicitly supports while GNU libtool will silently
ignore it.

Gentoo Bug: https://bugs.gentoo.org/785232
---
 backends/alsa/Makefile.am  | 1 +
 backends/null/Makefile.am  | 4 +++-
 backends/oss/Makefile.am   | 1 +
 backends/pulse/Makefile.am | 1 +
 4 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/backends/alsa/Makefile.am b/backends/alsa/Makefile.am
index 798ce8b..44990b5 100644
--- a/backends/alsa/Makefile.am
+++ b/backends/alsa/Makefile.am
@@ -43,6 +43,7 @@ libmatemixer_alsa_la_SOURCES =                                  \
 	alsa-types.h
 
 libmatemixer_alsa_la_LIBADD =                                   \
+	$(top_builddir)/libmatemixer/libmatemixer.la            \
 	$(GLIB_LIBS)                                            \
 	$(UDEV_LIBS)						\
 	$(ALSA_LIBS)
diff --git a/backends/null/Makefile.am b/backends/null/Makefile.am
index f0371a7..11d4b7f 100644
--- a/backends/null/Makefile.am
+++ b/backends/null/Makefile.am
@@ -18,7 +18,9 @@ libmatemixer_null_la_SOURCES =                                  \
 	null-backend.c                                          \
 	null-backend.h
 
-libmatemixer_null_la_LIBADD = $(GLIB_LIBS)
+libmatemixer_null_la_LIBADD =                                   \
+	$(top_builddir)/libmatemixer/libmatemixer.la            \
+	$(GLIB_LIBS)
 
 libmatemixer_null_la_LDFLAGS =                                  \
 	-avoid-version                                          \
diff --git a/backends/oss/Makefile.am b/backends/oss/Makefile.am
index d9e1fa7..cc5735f 100644
--- a/backends/oss/Makefile.am
+++ b/backends/oss/Makefile.am
@@ -32,6 +32,7 @@ libmatemixer_oss_la_SOURCES =                                   \
 	oss-types.h
 
 libmatemixer_oss_la_LIBADD =                                    \
+	$(top_builddir)/libmatemixer/libmatemixer.la            \
 	$(GLIB_LIBS)                                            \
 	$(OSS_LIBS)
 
diff --git a/backends/pulse/Makefile.am b/backends/pulse/Makefile.am
index b07cc7e..a079af1 100644
--- a/backends/pulse/Makefile.am
+++ b/backends/pulse/Makefile.am
@@ -62,6 +62,7 @@ libmatemixer_pulse_la_SOURCES =                                 \
 	pulse-types.h
 
 libmatemixer_pulse_la_LIBADD =                                  \
+	$(top_builddir)/libmatemixer/libmatemixer.la            \
 	$(GLIB_LIBS)                                            \
 	$(PULSEAUDIO_LIBS)