/usr/share/aclocal/ax_lib_gcrypt.m4 is in autoconf-archive 20131101-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# http://www.gnu.org/software/autoconf-archive/ax_lib_gcrypt.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_LIB_GCRYPT([yes|no|auto])
#
# DESCRIPTION
#
# Searches for the 'gcrypt' library with the --with... option.
#
# If found, define HAVE_GCRYPT and macro GCRYPT_LIBS and GCRYPT_CFLAGS.
# Also defines GCRYPT_WITH_<algo> for the algorithms found available.
# Possible algorithms are: AES ARCFOUR BLOWFISH CAST5 DES IDEA RFC2268
# SERPENT TWOFISH CRC HAVAL MD2 MD4 MD5 RMD160 SHA0 SHA1 SHA224 SHA256
# SHA384 SHA512 TIGER WHIRLPOOL DSA ELGAMAL RSA
#
# The argument is used if no --with...-gcrypt option is set. Value "yes"
# requires the configuration by default. Value "no" does not require it by
# default. Value "auto" configures the library only if available.
#
# See also AX_LIB_BEECRYPT and AX_LIB_CRYPTO.
#
# LICENSE
#
# Copyright (c) 2009 Fabien Coelho <autoconf.archive@coelho.net>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice
# and this notice are preserved. This file is offered as-is, without any
# warranty.
#serial 9
# AX_CHECK_GCRYPT_ALGO([algo])
# generate convenient defines for each algorithm
AC_DEFUN([AX_CHECK_GCRYPT_ALGO],[
AC_REQUIRE([AC_PROG_EGREP])
AC_MSG_CHECKING([for $1 in gcrypt])
if echo $gcrypt_algos | $EGREP -i ":.*( $1 | $1$)" > /dev/null ; then
AC_DEFINE([GCRYPT_WITH_$1],[1],[Algorithm $1 in gcrypt library])
AC_MSG_RESULT([yes])
else
AC_MSG_RESULT([no])
fi
])
# AX_LIB_GCRYPT([yes|no|auto])
AC_DEFUN([AX_LIB_GCRYPT],[
AC_MSG_CHECKING([whether gcrypt is enabled])
AC_ARG_WITH([gcrypt],[ --with-gcrypt require gcrypt library
--without-gcrypt disable gcrypt library],[
AC_MSG_RESULT([$withval])
ac_with_gcrypt=$withval
],[
AC_MSG_RESULT($1)
ac_with_gcrypt=$1
])
if test "$ac_with_gcrypt" = "yes" -o "$ac_with_gcrypt" = "auto" ; then
AM_PATH_LIBGCRYPT([1.2.0],[
AC_DEFINE([HAVE_GCRYPT],[1],[Gcrypt library is available])
HAVE_GCRYPT=1
# checking for available algorithms...
gcrypt_algos=`$LIBGCRYPT_CONFIG --algorithms`
# ciphers
# this does not work with a "for" loop: nothing generated in config.h:-(
AX_CHECK_GCRYPT_ALGO([AES])
AX_CHECK_GCRYPT_ALGO([ARCFOUR])
AX_CHECK_GCRYPT_ALGO([BLOWFISH])
AX_CHECK_GCRYPT_ALGO([CAST5])
AX_CHECK_GCRYPT_ALGO([DES])
AX_CHECK_GCRYPT_ALGO([IDEA])
AX_CHECK_GCRYPT_ALGO([RFC2268])
AX_CHECK_GCRYPT_ALGO([SERPENT])
AX_CHECK_GCRYPT_ALGO([TWOFISH])
# digests
AX_CHECK_GCRYPT_ALGO([CRC])
AX_CHECK_GCRYPT_ALGO([HAVAL])
AX_CHECK_GCRYPT_ALGO([MD2])
AX_CHECK_GCRYPT_ALGO([MD4])
AX_CHECK_GCRYPT_ALGO([MD5])
AX_CHECK_GCRYPT_ALGO([RMD160])
AX_CHECK_GCRYPT_ALGO([SHA0])
AX_CHECK_GCRYPT_ALGO([SHA1])
AX_CHECK_GCRYPT_ALGO([SHA224])
AX_CHECK_GCRYPT_ALGO([SHA256])
AX_CHECK_GCRYPT_ALGO([SHA384])
AX_CHECK_GCRYPT_ALGO([SHA512])
AX_CHECK_GCRYPT_ALGO([TIGER])
AX_CHECK_GCRYPT_ALGO([WHIRLPOOL])
# others
AX_CHECK_GCRYPT_ALGO([DSA])
AX_CHECK_GCRYPT_ALGO([ELGAMAL])
AX_CHECK_GCRYPT_ALGO([RSA])
# conclusion
GCRYPT_CFLAGS=`$LIBGCRYPT_CONFIG --cflags`
GCRYPT_LIBS=`$LIBGCRYPT_CONFIG --libs`
AC_SUBST(GCRYPT_CFLAGS)
AC_SUBST(GCRYPT_LIBS)
],[
# complain only if explicitely required
if test "$ac_with_gcrypt" = "yes" ; then
AC_MSG_ERROR([cannot configure required gcrypt library])
fi
])
fi
])
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