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+# pkg.m4 - Macros to locate and utilise pkg-config. -*- Autoconf -*-
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+# serial 12 (pkg-config-0.29.2)
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+
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+dnl Copyright © 2004 Scott James Remnant <scott@netsplit.com>.
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+dnl Copyright © 2012-2015 Dan Nicholson <dbn.lists@gmail.com>
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+dnl
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+dnl This program is free software; you can redistribute it and/or modify
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+dnl it under the terms of the GNU General Public License as published by
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+dnl the Free Software Foundation; either version 2 of the License, or
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+dnl (at your option) any later version.
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+dnl
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+dnl This program is distributed in the hope that it will be useful, but
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+dnl WITHOUT ANY WARRANTY; without even the implied warranty of
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+dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+dnl General Public License for more details.
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+dnl
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+dnl You should have received a copy of the GNU General Public License
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+dnl along with this program; if not, write to the Free Software
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+dnl Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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+dnl 02111-1307, USA.
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+dnl
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+dnl As a special exception to the GNU General Public License, if you
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+dnl distribute this file as part of a program that contains a
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+dnl configuration script generated by Autoconf, you may include it under
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+dnl the same distribution terms that you use for the rest of that
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+dnl program.
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+
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+dnl PKG_PREREQ(MIN-VERSION)
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+dnl -----------------------
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+dnl Since: 0.29
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+dnl
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+dnl Verify that the version of the pkg-config macros are at least
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+dnl MIN-VERSION. Unlike PKG_PROG_PKG_CONFIG, which checks the user's
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+dnl installed version of pkg-config, this checks the developer's version
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+dnl of pkg.m4 when generating configure.
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+dnl
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+dnl To ensure that this macro is defined, also add:
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+dnl m4_ifndef([PKG_PREREQ],
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+dnl [m4_fatal([must install pkg-config 0.29 or later before running autoconf/autogen])])
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+dnl
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+dnl See the "Since" comment for each macro you use to see what version
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+dnl of the macros you require.
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+m4_defun([PKG_PREREQ],
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+[m4_define([PKG_MACROS_VERSION], [0.29.2])
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+m4_if(m4_version_compare(PKG_MACROS_VERSION, [$1]), -1,
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+ [m4_fatal([pkg.m4 version $1 or higher is required but ]PKG_MACROS_VERSION[ found])])
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+])dnl PKG_PREREQ
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+
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+dnl PKG_PROG_PKG_CONFIG([MIN-VERSION])
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+dnl ----------------------------------
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+dnl Since: 0.16
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+dnl
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+dnl Search for the pkg-config tool and set the PKG_CONFIG variable to
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+dnl first found in the path. Checks that the version of pkg-config found
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+dnl is at least MIN-VERSION. If MIN-VERSION is not specified, 0.9.0 is
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+dnl used since that's the first version where most current features of
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+dnl pkg-config existed.
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+AC_DEFUN([PKG_PROG_PKG_CONFIG],
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+[m4_pattern_forbid([^_?PKG_[A-Z_]+$])
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+m4_pattern_allow([^PKG_CONFIG(_(PATH|LIBDIR|SYSROOT_DIR|ALLOW_SYSTEM_(CFLAGS|LIBS)))?$])
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+m4_pattern_allow([^PKG_CONFIG_(DISABLE_UNINSTALLED|TOP_BUILD_DIR|DEBUG_SPEW)$])
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+AC_ARG_VAR([PKG_CONFIG], [path to pkg-config utility])
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+AC_ARG_VAR([PKG_CONFIG_PATH], [directories to add to pkg-config's search path])
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+AC_ARG_VAR([PKG_CONFIG_LIBDIR], [path overriding pkg-config's built-in search path])
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+
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+if test "x$ac_cv_env_PKG_CONFIG_set" != "xset"; then
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+ AC_PATH_TOOL([PKG_CONFIG], [pkg-config])
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+fi
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+if test -n "$PKG_CONFIG"; then
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+ _pkg_min_version=m4_default([$1], [0.9.0])
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+ AC_MSG_CHECKING([pkg-config is at least version $_pkg_min_version])
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+ if $PKG_CONFIG --atleast-pkgconfig-version $_pkg_min_version; then
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+ AC_MSG_RESULT([yes])
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+ else
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+ AC_MSG_RESULT([no])
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+ PKG_CONFIG=""
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+ fi
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+fi[]dnl
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+])dnl PKG_PROG_PKG_CONFIG
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+
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+dnl PKG_CHECK_EXISTS(MODULES, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
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+dnl -------------------------------------------------------------------
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+dnl Since: 0.18
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+dnl
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+dnl Check to see whether a particular set of modules exists. Similar to
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+dnl PKG_CHECK_MODULES(), but does not set variables or print errors.
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+dnl
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+dnl Please remember that m4 expands AC_REQUIRE([PKG_PROG_PKG_CONFIG])
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+dnl only at the first occurence in configure.ac, so if the first place
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+dnl it's called might be skipped (such as if it is within an "if", you
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+dnl have to call PKG_CHECK_EXISTS manually
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+AC_DEFUN([PKG_CHECK_EXISTS],
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+[AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
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+if test -n "$PKG_CONFIG" && \
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+ AC_RUN_LOG([$PKG_CONFIG --exists --print-errors "$1"]); then
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+ m4_default([$2], [:])
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+m4_ifvaln([$3], [else
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+ $3])dnl
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+fi])
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+
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+dnl _PKG_CONFIG([VARIABLE], [COMMAND], [MODULES])
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+dnl ---------------------------------------------
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+dnl Internal wrapper calling pkg-config via PKG_CONFIG and setting
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+dnl pkg_failed based on the result.
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+m4_define([_PKG_CONFIG],
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+[if test -n "$$1"; then
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+ pkg_cv_[]$1="$$1"
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+ elif test -n "$PKG_CONFIG"; then
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+ PKG_CHECK_EXISTS([$3],
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+ [pkg_cv_[]$1=`$PKG_CONFIG --[]$2 "$3" 2>/dev/null`
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+ test "x$?" != "x0" && pkg_failed=yes ],
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+ [pkg_failed=yes])
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+ else
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+ pkg_failed=untried
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+fi[]dnl
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+])dnl _PKG_CONFIG
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+
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+dnl _PKG_SHORT_ERRORS_SUPPORTED
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+dnl ---------------------------
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+dnl Internal check to see if pkg-config supports short errors.
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+AC_DEFUN([_PKG_SHORT_ERRORS_SUPPORTED],
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+[AC_REQUIRE([PKG_PROG_PKG_CONFIG])
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+if $PKG_CONFIG --atleast-pkgconfig-version 0.20; then
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+ _pkg_short_errors_supported=yes
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+else
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+ _pkg_short_errors_supported=no
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+fi[]dnl
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+])dnl _PKG_SHORT_ERRORS_SUPPORTED
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+
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+
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+dnl PKG_CHECK_MODULES(VARIABLE-PREFIX, MODULES, [ACTION-IF-FOUND],
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+dnl [ACTION-IF-NOT-FOUND])
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+dnl --------------------------------------------------------------
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+dnl Since: 0.4.0
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+dnl
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+dnl Note that if there is a possibility the first call to
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+dnl PKG_CHECK_MODULES might not happen, you should be sure to include an
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+dnl explicit call to PKG_PROG_PKG_CONFIG in your configure.ac
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+AC_DEFUN([PKG_CHECK_MODULES],
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+[AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
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+AC_ARG_VAR([$1][_CFLAGS], [C compiler flags for $1, overriding pkg-config])dnl
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+AC_ARG_VAR([$1][_LIBS], [linker flags for $1, overriding pkg-config])dnl
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+
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+pkg_failed=no
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+AC_MSG_CHECKING([for $2])
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+
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+_PKG_CONFIG([$1][_CFLAGS], [cflags], [$2])
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+_PKG_CONFIG([$1][_LIBS], [libs], [$2])
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+
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+m4_define([_PKG_TEXT], [Alternatively, you may set the environment variables $1[]_CFLAGS
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+and $1[]_LIBS to avoid the need to call pkg-config.
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+See the pkg-config man page for more details.])
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+
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+if test $pkg_failed = yes; then
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+ AC_MSG_RESULT([no])
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+ _PKG_SHORT_ERRORS_SUPPORTED
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+ if test $_pkg_short_errors_supported = yes; then
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+ $1[]_PKG_ERRORS=`$PKG_CONFIG --short-errors --print-errors --cflags --libs "$2" 2>&1`
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+ else
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+ $1[]_PKG_ERRORS=`$PKG_CONFIG --print-errors --cflags --libs "$2" 2>&1`
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+ fi
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+ # Put the nasty error message in config.log where it belongs
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+ echo "$$1[]_PKG_ERRORS" >&AS_MESSAGE_LOG_FD
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+
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+ m4_default([$4], [AC_MSG_ERROR(
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+[Package requirements ($2) were not met:
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+
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+$$1_PKG_ERRORS
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+
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+Consider adjusting the PKG_CONFIG_PATH environment variable if you
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+installed software in a non-standard prefix.
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+
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+_PKG_TEXT])[]dnl
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+ ])
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+elif test $pkg_failed = untried; then
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+ AC_MSG_RESULT([no])
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+ m4_default([$4], [AC_MSG_FAILURE(
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+[The pkg-config script could not be found or is too old. Make sure it
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+is in your PATH or set the PKG_CONFIG environment variable to the full
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+path to pkg-config.
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+
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+_PKG_TEXT
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+
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+To get pkg-config, see <http://pkg-config.freedesktop.org/>.])[]dnl
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+ ])
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+else
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+ $1[]_CFLAGS=$pkg_cv_[]$1[]_CFLAGS
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+ $1[]_LIBS=$pkg_cv_[]$1[]_LIBS
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+ AC_MSG_RESULT([yes])
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+ $3
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+fi[]dnl
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+])dnl PKG_CHECK_MODULES
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+
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+
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+dnl PKG_CHECK_MODULES_STATIC(VARIABLE-PREFIX, MODULES, [ACTION-IF-FOUND],
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+dnl [ACTION-IF-NOT-FOUND])
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+dnl ---------------------------------------------------------------------
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+dnl Since: 0.29
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+dnl
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+dnl Checks for existence of MODULES and gathers its build flags with
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+dnl static libraries enabled. Sets VARIABLE-PREFIX_CFLAGS from --cflags
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+dnl and VARIABLE-PREFIX_LIBS from --libs.
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+dnl
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+dnl Note that if there is a possibility the first call to
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+dnl PKG_CHECK_MODULES_STATIC might not happen, you should be sure to
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+dnl include an explicit call to PKG_PROG_PKG_CONFIG in your
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+dnl configure.ac.
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+AC_DEFUN([PKG_CHECK_MODULES_STATIC],
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+[AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
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+_save_PKG_CONFIG=$PKG_CONFIG
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+PKG_CONFIG="$PKG_CONFIG --static"
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+PKG_CHECK_MODULES($@)
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+PKG_CONFIG=$_save_PKG_CONFIG[]dnl
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+])dnl PKG_CHECK_MODULES_STATIC
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+
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+
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+dnl PKG_INSTALLDIR([DIRECTORY])
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+dnl -------------------------
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+dnl Since: 0.27
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+dnl
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+dnl Substitutes the variable pkgconfigdir as the location where a module
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+dnl should install pkg-config .pc files. By default the directory is
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+dnl $libdir/pkgconfig, but the default can be changed by passing
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+dnl DIRECTORY. The user can override through the --with-pkgconfigdir
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+dnl parameter.
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+AC_DEFUN([PKG_INSTALLDIR],
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+[m4_pushdef([pkg_default], [m4_default([$1], ['${libdir}/pkgconfig'])])
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+m4_pushdef([pkg_description],
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+ [pkg-config installation directory @<:@]pkg_default[@:>@])
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+AC_ARG_WITH([pkgconfigdir],
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+ [AS_HELP_STRING([--with-pkgconfigdir], pkg_description)],,
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+ [with_pkgconfigdir=]pkg_default)
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+AC_SUBST([pkgconfigdir], [$with_pkgconfigdir])
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+m4_popdef([pkg_default])
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+m4_popdef([pkg_description])
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+])dnl PKG_INSTALLDIR
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+
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+
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+dnl PKG_NOARCH_INSTALLDIR([DIRECTORY])
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+dnl --------------------------------
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+dnl Since: 0.27
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+dnl
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+dnl Substitutes the variable noarch_pkgconfigdir as the location where a
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+dnl module should install arch-independent pkg-config .pc files. By
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+dnl default the directory is $datadir/pkgconfig, but the default can be
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+dnl changed by passing DIRECTORY. The user can override through the
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+dnl --with-noarch-pkgconfigdir parameter.
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+AC_DEFUN([PKG_NOARCH_INSTALLDIR],
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+[m4_pushdef([pkg_default], [m4_default([$1], ['${datadir}/pkgconfig'])])
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+m4_pushdef([pkg_description],
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+ [pkg-config arch-independent installation directory @<:@]pkg_default[@:>@])
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+AC_ARG_WITH([noarch-pkgconfigdir],
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+ [AS_HELP_STRING([--with-noarch-pkgconfigdir], pkg_description)],,
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+ [with_noarch_pkgconfigdir=]pkg_default)
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+AC_SUBST([noarch_pkgconfigdir], [$with_noarch_pkgconfigdir])
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+m4_popdef([pkg_default])
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+m4_popdef([pkg_description])
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+])dnl PKG_NOARCH_INSTALLDIR
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+
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+
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+dnl PKG_CHECK_VAR(VARIABLE, MODULE, CONFIG-VARIABLE,
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+dnl [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
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+dnl -------------------------------------------
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+dnl Since: 0.28
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+dnl
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+dnl Retrieves the value of the pkg-config variable for the given module.
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+AC_DEFUN([PKG_CHECK_VAR],
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+[AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
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+AC_ARG_VAR([$1], [value of $3 for $2, overriding pkg-config])dnl
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+
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+_PKG_CONFIG([$1], [variable="][$3]["], [$2])
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+AS_VAR_COPY([$1], [pkg_cv_][$1])
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+
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+AS_VAR_IF([$1], [""], [$5], [$4])dnl
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+])dnl PKG_CHECK_VAR
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Ozkan Sezer