Hello! CVS Automake uses am_line_error() to inform the user that it's installing files. As a result, --Werror causes Automake to exit after it installs the first file: $ automake --Werror --add-missing; echo $? automake: Makefile.am: installing `./INSTALL' 2 $ automake --Werror --add-missing; echo $? automake: Makefile.am: required file `./NEWS' not found 2 Sorry, no patch. Regards, Pavel Roskin