/usr/share/aclocal/ax_czmq.m4 is in autoconf-archive 20160916-1.
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_czmq.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_CZMQ([MINIMUM-VERSION], [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
#
# DESCRIPTION
#
# Test for the CZMQ libraries of a particular version (or newer). The
# default version tested for is 3.0.0.
#
# The macro tests for CZMQ libraries in the library/include path, and,
# when provided, also in the path given by --with-czmq.
#
# This macro calls:
#
# AC_SUBST(CZMQ_CPPFLAGS) / AC_SUBST(CZMQ_LDFLAGS) / AC_SUBST(CZMQ_LIBS)
#
# And sets:
#
# HAVE_CZMQ
#
# LICENSE
#
# Copyright (c) 2016 Jeroen Meijer <jjgmeijer@gmail.com>
#
# 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 1
AC_DEFUN([AX_CZMQ], [
AC_ARG_WITH([czmq], [AS_HELP_STRING([--with-czmq=<prefix>],[CZMQ prefix directory])], [
CZMQ_LDFLAGS="-L${with_czmq}/lib"
CZMQ_CPPFLAGS="-I${with_czmq}/include"
])
HAVE_CZMQ=0
if test "$with_czmq" != "no"; then
LD_FLAGS="$LDFLAGS $CZMQ_LDFLAGS"
CPPFLAGS="$CPPFLAGS $CZMQ_CPPFLAGS"
AC_LANG_SAVE
AC_LANG_C
AC_CHECK_HEADER(czmq.h, [czmq_h=yes], [czmq_h=no])
AC_LANG_RESTORE
if test "$czmq_h" = "yes"; then
version=ifelse([$1], ,3.0.0,$1)
AC_MSG_CHECKING([for CZMQ version >= $version])
version=$(echo $version | tr '.' ',')
AC_EGREP_CPP([version_ok], [
#include <czmq.h>
#if defined(CZMQ_VERSION) && CZMQ_VERSION >= CZMQ_MAKE_VERSION($version)
version_ok
#endif
],[
AC_MSG_RESULT(yes)
HAVE_CZMQ=1
CZMQ_LIBS="-lczmq"
AC_SUBST(CZMQ_LDFLAGS)
AC_SUBST(CZMQ_CPPFLAGS)
AC_SUBST(CZMQ_LIBS)
], AC_MSG_RESULT([no valid CZMQ version was found]))
else
AC_MSG_WARN([no valid CZMQ installation was found])
fi
if test $HAVE_CZMQ = 1; then
# execute ACTION-IF-FOUND (if present):
ifelse([$2], , :, [$2])
else
# execute ACTION-IF-NOT-FOUND (if present):
ifelse([$3], , :, [$3])
fi
else
AC_MSG_NOTICE([not checking for CZMQ])
fi
AC_DEFINE(HAVE_CZMQ,,[define if the CZMQ library is available])
])
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