+# Check for pkg-config manually first, as if its not installed the
+# PKG_PROG_PKG_CONFIG macro won't be defined.
+AC_CHECK_PROG(have_pkg_config, pkg-config, yes, no)
+
+if test x"$have_pkg_config" == xno; then
+ AC_MSG_ERROR(pkg-config is required to install this program)
+fi
+