libxfcegui4-dev 4.3.99.2-0ubuntu1 (i386 binary) in ubuntu feisty

 This package contains the headers and the static library
 for libxfcegui4-4. If you intend to code applications
 which use some of these functions (probably Xfce4-based
 applications), then you have to install this package.
 .
 Homepage: http://www.xfce.org/