/usr/share/aclocal/ax_prog_tcl.m4 is in autoconf-archive 20170928-2.
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The actual contents of the file can be viewed below.
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# https://www.gnu.org/software/autoconf-archive/ax_prog_tcl.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_PROG_TCL([min-version])
#
# DESCRIPTION
#
# Searches for tcl (tclsh and wish) in PATH and checks which version is
# installed. The macro bails out if either tcl is not found or the minimum
# version is not satisfied, unless minimum version is "0".
#
# Example:
#
# AX_PROG_TCL
#
# This checks for tcl and if not found, exits with an error. If found, it
# prints tcl path and version number.
#
# AX_PROG_TCL([8.0])
#
# Checks for tcl and exits with an error if its not found or the version
# is below 8.0.
#
# LICENSE
#
# Copyright (c) 2008 David Cluytens
# Copyright (c) 2008 Uwe Mayer <merkosh@hadiko.de>
#
# This program is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation, either version 3 of the License, or (at your
# option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
# Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program. If not, see <https://www.gnu.org/licenses/>.
#
# As a special exception, the respective Autoconf Macro's copyright owner
# gives unlimited permission to copy, distribute and modify the configure
# scripts that are the output of Autoconf when processing the Macro. You
# need not follow the terms of the GNU General Public License when using
# or distributing such scripts, even though portions of the text of the
# Macro appear in them. The GNU General Public License (GPL) does govern
# all other use of the material that constitutes the Autoconf Macro.
#
# This special exception to the GPL applies to versions of the Autoconf
# Macro released by the Autoconf Archive. When you make and distribute a
# modified version of the Autoconf Macro, you may extend this special
# exception to the GPL to apply to your modified version as well.
#serial 8
AC_DEFUN([AX_PROG_TCL], [
#-- check for tclsh in PATH
AC_PATH_PROG([TCLSH], [tclsh], [no])
if [(test x"$TCLSH" == x"no") && (test x"$1" != x"0")]; then
AC_MSG_ERROR([tclsh not found])
fi
#-- check for wish in PATH
AC_PATH_PROG([WISH], [wish], [no])
#-- check vor tcl version
AC_MSG_CHECKING([tcl version])
version=`echo "puts [[set tcl_version]]" | tclsh -`
AC_MSG_RESULT([$version])
#-- compare tcl version with min-version
required=$1
if [(test x"$1" != x"") && (test "${required/./}" -gt "${version/./}")]; then
AC_MSG_ERROR([tcl version $1 required])
fi
])dnl
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