PKG_CHECK_VAR.m4
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PKG_CHECK_VAR.m4
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	dnl PKG_CHECK_VAR(VARIABLE, MODULE, CONFIG-VARIABLE,
	dnl [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
	dnl -------------------------------------------
	dnl Since: 0.28
	dnl
	dnl Retrieves the value of the pkg-config variable for the given module.
	dnl
	dnl Origin (declared license: GPLv2+ with less restrictive exception):
	dnl https://cgit.freedesktop.org/pkg-config/tree/pkg.m4.in?h=pkg-config-0.29.1#n261
	dnl (AS_VAR_COPY replaced with backward-compatible equivalent and guard
	dnl to prefer system-wide variant by Jan Pokorny <jpokorny@redhat.com>)

	m4_ifndef([PKG_CHECK_VAR],[
	AC_DEFUN([PKG_CHECK_VAR],
	[AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
	AC_ARG_VAR([$1], [value of $3 for $2, overriding pkg-config])dnl

	_PKG_CONFIG([$1], [variable="][$3]["], [$2])
	dnl AS_VAR_COPY([$1], [pkg_cv_][$1])
	$1=AS_VAR_GET([pkg_cv_][$1])

	AS_VAR_IF([$1], [""], [$5], [$4])dnl
	])dnl PKG_CHECK_VAR
	])dnl m4_ifndef