error when comie xfce4-setting and xfwm4

dummy@example.com (happyrobo) — Sat, 20 Aug 2011 11:05:54 +0000

when I installing xfce4-8 on my blfs svn I got these error when compile package xfce4-setting and xfwm4, here is the error:

xfce4_display_settings-xfce-randr.o: In function `xfce_randr_populate':
xfce-randr.c:(.text+0x10b9): undefined reference to `XRRGetOutputPrimary'
xfce4_display_settings-xfce-randr.o: In function `xfce_randr_reload':
xfce-randr.c:(.text+0x1238): undefined reference to `XRRGetScreenResourcesCurrent'

anyone can help me?

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error when comie xfce4-setting and xfwm4