Hence /usr/share/appdata is deprecated, this patch changes the directory to /usr/share/metainfo
--- b/aclocal.m4	2016-12-05 20:32:24.000000000 +0100
+++ a/aclocal.m4	2021-12-16 15:35:52.050204703 +0100
@@ -334,7 +334,7 @@
          AS_IF([test "x$enable_appdata_validate" = "xyes"],
                [AC_MSG_ERROR([AppData validation was requested but appstream-util was not found])])])
 
-  AC_SUBST([appdataxmldir], [${datadir}/appdata])
+  AC_SUBST([appdataxmldir], [${datadir}/metainfo])
 
   APPDATA_XML_RULES='
 .PHONY : uninstall-appdata-xml install-appdata-xml clean-appdata-xml
--- b/configure	2016-12-05 20:32:24.000000000 +0100
+++ a/configure	2021-12-16 15:35:12.635202455 +0100
@@ -12864,7 +12864,7 @@
 fi
 fi
 
-  appdataxmldir=${datadir}/appdata
+  appdataxmldir=${datadir}/metainfo
 
 
   APPDATA_XML_RULES='