/usr/share/aclocal/sc_c_version.m4 is in libp4est-dev 1.1-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# From: http://autoconf-archive.cryp.to/ax_gcc_version.html
# and renamed by Carsten Burstedde <carsten@ices.utexas.edu>
# ===========================================================================
#
# SYNOPSIS
#
# SC_C_VERSION (Extension of AX_GCC_VERSION to more C compilers)
#
# DESCRIPTION
#
# This macro retrieves the cc version and returns it in the C_VERSION
# variable if available, an empty string otherwise.
#
# LAST MODIFICATION
#
# 2009-02-09
#
# COPYLEFT
#
# Copyright (c) 2008 Lucas Wilcox <lucasw@ices.utexas.edu>
# Copyright (c) 2008 Francesco Salvestrini <salvestrini@users.sourceforge.net>
#
# 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 2 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 <http://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 Macro 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.
AC_DEFUN([SC_C_VERSION], [
C_VERSION=""
AS_IF([test "x$C_VERSION" = "x"],[
SC_C_CHECK_FLAG([-V],[],[],[
sc_pgcc_version_option=yes
],[
sc_pgcc_version_option=no
])
AS_IF([test "x$sc_pgcc_version_option" != "xno"],[
AC_CACHE_CHECK([pgcc version],[sc_cv_pgcc_version],[
# The sed part removes all new lines
sc_cv_pgcc_version="`$CC -V 2>/dev/null | sed -e :a -e '$!N; s/\n/ /; ta'`"
AS_IF([test "x$sc_cv_pgcc_version" = "x"],[
sc_cv_pgcc_version=""
])
])
C_VERSION=$sc_cv_pgcc_version
])
])
AS_IF([test "x$C_VERSION" = "x"],[
SC_C_CHECK_FLAG([-dumpversion],[],[],[
sc_gcc_version_option=yes
],[
sc_gcc_version_option=no
])
AS_IF([test "x$sc_gcc_version_option" != "xno"],[
AC_CACHE_CHECK([gcc version],[sc_cv_gcc_version],[
# The sed part removes all new lines
sc_cv_gcc_version="`$CC -dumpversion | sed -e :a -e '$!N; s/\n/ /; ta'`"
AS_IF([test "x$sc_cv_gcc_version" = "x"],[
sc_cv_gcc_version=""
])
])
C_VERSION=$sc_cv_gcc_version
])
])
AC_SUBST([C_VERSION])
])
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