+PKG_CHECK_EXISTS(libudev >= 218, [old_udev=no], [old_udev=yes])
+if test "$old_udev" = "yes" ; then
+ AC_DEFINE(UDEV_LOGGING, 1, [Support old udev logging interface])],
+fi
+
+AC_CHECK_LIB([devmapper], [dm_task_create],
+ [DEVMAPPER_LIBS=-ldevmapper],
+ [AC_MSG_FAILURE([The libdevmapper development library is required by petitboot. Try installing the package libdevmapper-dev or libdevmapper-devel.])]
+)
+
+AC_ARG_WITH([fdt],
+ AS_HELP_STRING([--without-fdt],
+ [Build without libfdt (default: no)]))
+
+AS_IF([test "x$with_fdt" != "xno"],
+ AC_CHECK_LIB([fdt], [fdt_check_header],
+ [FDT_LIBS=-lfdt; have_libfdt=yes]))
+
+AM_CONDITIONAL([HAVE_LIBFDT], [test x"$have_libfdt" = xyes])
+