Build control-center in mock fail

[Igor Gnatenko]

I use mock to local build packages.
I was build control-center in mock. But always error...
How I fix it ?
  GEN      gnome-control-center.1
I/O error : Attempt to load network entity
http://docbook.sourceforge.net/release/xsl/current/manpages/docbook.xsl
warning: failed to load external entity
"http://docbook.sourceforge.net/release/xsl/current/manpages/docbook.xsl"
cannot parse
http://docbook.sourceforge.net/release/xsl/current/manpages/docbook.xsl
make[2]: Leaving directory
`/builddir/build/BUILD/gnome-control-center-3.8.1/man'
make[2]: *** [gnome-control-center.1] Error 4
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory
`/builddir/build/BUILD/gnome-control-center-3.8.1'
make: *** [all] Error 2
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