Borrowed from https://github.com/gentoo/gentoo/blob/1020fac5527ad96643ca8874fe8c4254a4bf7153/media-sound/deadbeef/files/deadbeef-1.9.2-drop-Werror.patch

diff --git a/configure.ac b/configure.ac
index e11ae7e..8e3c590 100644
--- a/configure.ac
+++ b/configure.ac
@@ -337,7 +337,7 @@ AS_IF([test "${have_iconv}" = "yes"], [
     AC_DEFINE(HAVE_LIBICONV,1,[Use libiconv instead of glibc iconv])
 ])
 
-AX_CHECK_COMPILER_FLAGS(-msse2, HAVE_SSE2=1, [], -Werror)
+AX_CHECK_COMPILER_FLAGS(-msse2, HAVE_SSE2=1, [])
 AS_IF([test "${HAVE_SSE2}"], [
     AC_DEFINE(HAVE_SSE2,1,[Support SSE2 instructions])
 ])
diff --git a/plugins/gtkui/Makefile.am b/plugins/gtkui/Makefile.am
index 739cdbb..cc0dce9 100644
--- a/plugins/gtkui/Makefile.am
+++ b/plugins/gtkui/Makefile.am
@@ -94,7 +94,7 @@ ddb_gui_GTK2_la_LDFLAGS = -module -avoid-version
 
 ddb_gui_GTK2_la_LIBADD = $(LDADD) $(GTK2_DEPS_LIBS) $(SM_LIBADD) ../libparser/libparser.la ../../shared/libtrkpropertiesutil.la ../../shared/libeqpreset.la ../../shared/libdeletefromdisk.la ../../shared/libtftintutil.la ../../analyzer/libanalyzer.la ../../scope/libscope.la $(JANSSON_LIBS) $(DISPATCH_LIBS)
 
-ddb_gui_GTK2_la_CFLAGS = -std=c99 -Werror -DGLIB_DISABLE_DEPRECATION_WARNINGS -DGDK_DISABLE_DEPRECATION_WARNINGS -DGTK_DISABLE_DEPRECATION_WARNINGS $(GTK2_DEPS_CFLAGS) $(SM_CFLAGS) $(JANSSON_CFLAGS) $(DISPATCH_CFLAGS) -DDDB_WARN_DEPRECATED=1
+ddb_gui_GTK2_la_CFLAGS = -std=c99 -DGLIB_DISABLE_DEPRECATION_WARNINGS -DGDK_DISABLE_DEPRECATION_WARNINGS -DGTK_DISABLE_DEPRECATION_WARNINGS $(GTK2_DEPS_CFLAGS) $(SM_CFLAGS) $(JANSSON_CFLAGS) $(DISPATCH_CFLAGS) -DDDB_WARN_DEPRECATED=1
 
 endif
 
@@ -105,7 +105,7 @@ ddb_gui_GTK3_la_LDFLAGS = -module -avoid-version
 
 ddb_gui_GTK3_la_SOURCES = $(GTKUI_SOURCES_GTK3)
 ddb_gui_GTK3_la_LIBADD = $(LDADD) $(GTK3_DEPS_LIBS) $(SM_LIBADD) ../libparser/libparser.la ../../shared/libtrkpropertiesutil.la ../../shared/libeqpreset.la ../../shared/libdeletefromdisk.la ../../shared/libtftintutil.la ../../analyzer/libanalyzer.la ../../scope/libscope.la $(JANSSON_LIBS) $(DISPATCH_LIBS)
-ddb_gui_GTK3_la_CFLAGS = -std=c99 -Werror -DGLIB_DISABLE_DEPRECATION_WARNINGS -DGDK_DISABLE_DEPRECATION_WARNINGS -DGTK_DISABLE_DEPRECATION_WARNINGS $(GTK3_DEPS_CFLAGS) $(SM_CFLAGS) $(JANSSON_CFLAGS) $(DISPATCH_CFLAGS) -DDDB_WARN_DEPRECATED=1
+ddb_gui_GTK3_la_CFLAGS = -std=c99 -DGLIB_DISABLE_DEPRECATION_WARNINGS -DGDK_DISABLE_DEPRECATION_WARNINGS -DGTK_DISABLE_DEPRECATION_WARNINGS $(GTK3_DEPS_CFLAGS) $(SM_CFLAGS) $(JANSSON_CFLAGS) $(DISPATCH_CFLAGS) -DDDB_WARN_DEPRECATED=1
 ddb_gui_GTK3_la_OBJCFLAGS = $(GTK3_DEPS_CFLAGS) $(SM_CFLAGS) $(JANSSON_CFLAGS)
 
 nodist_ddb_gui_GTK3_la_SOURCES = gtkui-gresources.c
diff --git a/plugins/gtkui/Makefile.in b/plugins/gtkui/Makefile.in
index 319bda2..66baad7 100644
--- a/plugins/gtkui/Makefile.in
+++ b/plugins/gtkui/Makefile.in
@@ -723,12 +723,12 @@ sdk_HEADERS = gtkui_api.h
 @HAVE_GTK2_TRUE@ddb_gui_GTK2_la_SOURCES = $(GTKUI_SOURCES_GTK2)
 @HAVE_GTK2_TRUE@ddb_gui_GTK2_la_LDFLAGS = -module -avoid-version
 @HAVE_GTK2_TRUE@ddb_gui_GTK2_la_LIBADD = $(LDADD) $(GTK2_DEPS_LIBS) $(SM_LIBADD) ../libparser/libparser.la ../../shared/libtrkpropertiesutil.la ../../shared/libeqpreset.la ../../shared/libdeletefromdisk.la ../../shared/libtftintutil.la ../../analyzer/libanalyzer.la ../../scope/libscope.la $(JANSSON_LIBS) $(DISPATCH_LIBS)
-@HAVE_GTK2_TRUE@ddb_gui_GTK2_la_CFLAGS = -std=c99 -Werror -DGLIB_DISABLE_DEPRECATION_WARNINGS -DGDK_DISABLE_DEPRECATION_WARNINGS -DGTK_DISABLE_DEPRECATION_WARNINGS $(GTK2_DEPS_CFLAGS) $(SM_CFLAGS) $(JANSSON_CFLAGS) $(DISPATCH_CFLAGS) -DDDB_WARN_DEPRECATED=1
+@HAVE_GTK2_TRUE@ddb_gui_GTK2_la_CFLAGS = -std=c99 -DGLIB_DISABLE_DEPRECATION_WARNINGS -DGDK_DISABLE_DEPRECATION_WARNINGS -DGTK_DISABLE_DEPRECATION_WARNINGS $(GTK2_DEPS_CFLAGS) $(SM_CFLAGS) $(JANSSON_CFLAGS) $(DISPATCH_CFLAGS) -DDDB_WARN_DEPRECATED=1
 @HAVE_GTK3_TRUE@GTKUI_SOURCES_GTK3 = deadbeefapp.c deadbeefapp.h $(GTKUI_SOURCES)
 @HAVE_GTK3_TRUE@ddb_gui_GTK3_la_LDFLAGS = -module -avoid-version
 @HAVE_GTK3_TRUE@ddb_gui_GTK3_la_SOURCES = $(GTKUI_SOURCES_GTK3)
 @HAVE_GTK3_TRUE@ddb_gui_GTK3_la_LIBADD = $(LDADD) $(GTK3_DEPS_LIBS) $(SM_LIBADD) ../libparser/libparser.la ../../shared/libtrkpropertiesutil.la ../../shared/libeqpreset.la ../../shared/libdeletefromdisk.la ../../shared/libtftintutil.la ../../analyzer/libanalyzer.la ../../scope/libscope.la $(JANSSON_LIBS) $(DISPATCH_LIBS)
-@HAVE_GTK3_TRUE@ddb_gui_GTK3_la_CFLAGS = -std=c99 -Werror -DGLIB_DISABLE_DEPRECATION_WARNINGS -DGDK_DISABLE_DEPRECATION_WARNINGS -DGTK_DISABLE_DEPRECATION_WARNINGS $(GTK3_DEPS_CFLAGS) $(SM_CFLAGS) $(JANSSON_CFLAGS) $(DISPATCH_CFLAGS) -DDDB_WARN_DEPRECATED=1
+@HAVE_GTK3_TRUE@ddb_gui_GTK3_la_CFLAGS = -std=c99 -DGLIB_DISABLE_DEPRECATION_WARNINGS -DGDK_DISABLE_DEPRECATION_WARNINGS -DGTK_DISABLE_DEPRECATION_WARNINGS $(GTK3_DEPS_CFLAGS) $(SM_CFLAGS) $(JANSSON_CFLAGS) $(DISPATCH_CFLAGS) -DDDB_WARN_DEPRECATED=1
 @HAVE_GTK3_TRUE@ddb_gui_GTK3_la_OBJCFLAGS = $(GTK3_DEPS_CFLAGS) $(SM_CFLAGS) $(JANSSON_CFLAGS)
 @HAVE_GTK3_TRUE@nodist_ddb_gui_GTK3_la_SOURCES = gtkui-gresources.c
 @HAVE_GTK3_TRUE@BUILT_SOURCES = gtkui-gresources.c