Use $(PACKAGE) instead of 'mutt' ---
diff -urN mutt/Makefile.am mutt.fix/Makefile.am --- mutt/Makefile.am 2016-03-17 23:22:15.547234169 +0000 +++ mutt.fix/Makefile.am 2016-03-17 23:15:32.711048802 +0000 @@ -112,7 +112,7 @@ CLEANFILES = mutt_dotlock.c keymap_alldefs.h $(BUILT_SOURCES) -DISTCLEANFILES= flea smime_keys txt2c po/mutt.pot +DISTCLEANFILES= flea smime_keys txt2c po/$(PACKAGE).pot ACLOCAL_AMFLAGS = -I m4
