gtk 2 gecko error while complile yelp!

[张召伟]

my system ubuntu desktop: 610 ,    yelp:   2.16.1-0ubuntu2

I download yelp source with command "apt-get source yelp",  with no 
change, then run  "dpkg-buildpackage -rfakeroot" to build yelp package, 
but have error:

checking whether we have a gtk 2 gecko build... configure: error: This
program needs a gtk 2 gecko build

I search this error mesg in google, but have no useful info, what causes
this problem and howto resolve it ?

Best Regards!

walker