AC_SUBST([LIBXML2_CFLAGS])
AC_SUBST([LIBXML2_LIBS])
+dnl Augeas (required)
+PKG_CHECK_MODULES([AUGEAS], [augeas])
+AC_SUBST([AUGEAS_CFLAGS])
+AC_SUBST([AUGEAS_LIBS])
+
dnl hivex library (highly recommended).
dnl This used to be a part of libguestfs, but was spun off into its
dnl own separate upstream project in libguestfs 1.0.85.