libxtst-dev 2:1.0.2-1ubuntu1 (amd64 binary) in ubuntu gutsy

 libXtst provides an X Window System client interface to the Record
 extension to the X protocol.
 .
 The Record extension allows X clients to synthesise input events, which
 is useful for automated testing.
 .
 This package contains the development headers for the library found in
 libxtst6. Non-developers likely have little use for this package.
 .
 More information about X.Org can be found at:
 <URL:http://xorg.freedesktop.org>
 <URL:http://lists.freedesktop.org/mailman/listinfo/xorg>