PKG_CHECK_VAR is now provided by varnish-legacy.m4

configure.ac

@@ -33,24 +33,6 @@ AC_CHECK_HEADERS([sys/stdlib.h])
 VMOD_TESTS="$(cd $srcdir/src && echo tests/*.vtc)"
 AC_SUBST(VMOD_TESTS)
 
-# backwards compat with older pkg-config
-# - pull in AC_DEFUN from pkg.m4
-m4_ifndef([PKG_CHECK_VAR], [
-# PKG_CHECK_VAR(VARIABLE, MODULE, CONFIG-VARIABLE,
-# [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
-# -------------------------------------------
-# Retrieves the value of the pkg-config variable for the given module.
-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])
-AS_VAR_COPY([$1], [pkg_cv_][$1])
-
-AS_VAR_IF([$1], [""], [$5], [$4])dnl
-])# PKG_CHECK_VAR
-])
-
 PKG_CHECK_MODULES([libvarnishapi], [varnishapi])
 PKG_CHECK_VAR([LIBVARNISHAPI_PREFIX], [varnishapi], [prefix])
 PKG_CHECK_VAR([LIBVARNISHAPI_DATAROOTDIR], [varnishapi], [datarootdir])