https://bugs.gentoo.org/775752
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -6,5 +6,5 @@ check_PROGRAMS = controller
 
 controller_SOURCES = controller.c ../dssi/dssi.h
 
-controller_CFLAGS = -Wall -Werror -I$(top_srcdir)/dssi $(ALSA_CFLAGS)
+controller_CFLAGS = -Wall -I$(top_srcdir)/dssi $(ALSA_CFLAGS)