autoreconf --version (return code: 0)
autoreconf (GNU Autoconf) 2.69 Copyright (C) 2012 Free Software Foundation, Inc. License GPLv3+/Autoconf: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>, <http://gnu.org/licenses/exceptions.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Written by David J. MacKenzie and Akim Demaille.
autoreconf --help (return code: 0)
Usage: /usr/bin/autoreconf [OPTION]... [DIRECTORY]... Run `autoconf' (and `autoheader', `aclocal', `automake', `autopoint' (formerly `gettextize'), and `libtoolize' where appropriate) repeatedly to remake the GNU Build System files in specified DIRECTORIES and their subdirectories (defaulting to `.'). By default, it only remakes those files that are older than their sources. If you install new versions of the GNU Build System, you can make `autoreconf' remake all of the files by giving it the `--force' option. Operation modes: -h, --help print this help, then exit -V, --version print version number, then exit -v, --verbose verbosely report processing -d, --debug don't remove temporary files -f, --force consider all files obsolete -i, --install copy missing auxiliary files --no-recursive don't rebuild sub-packages -s, --symlink with -i, install symbolic links instead of copies -m, --make when applicable, re-run ./configure && make -W, --warnings=CATEGORY report the warnings falling in CATEGORY [syntax] Warning categories include: `cross' cross compilation issues `gnu' GNU coding standards (default in gnu and gnits modes) `obsolete' obsolete features or constructions `override' user redefinitions of Automake rules or variables `portability' portability issues (default in gnu and gnits modes) `syntax' dubious syntactic constructs (default) `unsupported' unsupported or incomplete features (default) `all' all the warnings `no-CATEGORY' turn off warnings in CATEGORY `none' turn off all the warnings `error' treat warnings as errors The environment variable `WARNINGS' is honored. Some subtools might support other warning types, using `all' is encouraged. Library directories: -B, --prepend-include=DIR prepend directory DIR to search path -I, --include=DIR append directory DIR to search path The environment variables AUTOM4TE, AUTOCONF, AUTOHEADER, AUTOMAKE, ACLOCAL, AUTOPOINT, LIBTOOLIZE, M4, and MAKE are honored. Report bugs to <email@example.com>. GNU Autoconf home page: <http://www.gnu.org/software/autoconf/>. General help using GNU software: <http://www.gnu.org/gethelp/>.