+PKG_CHECK_MODULES(BLKID, blkid >= 2.20)
+PKG_CHECK_MODULES(KMOD, libkmod >= 2)
+
+AC_ARG_WITH([rootprefix],
+ AS_HELP_STRING([--with-rootprefix=DIR], [rootfs directory prefix for config files and kernel modules]),
+ [], [with_rootprefix=$prefix])
+AC_SUBST([rootprefix], [$with_rootprefix])