libfs-dev - 2:1.0.10-1 main

libFS, the Font Services library, provides various functions useful to
X11 font servers, and clients connecting to font servers. It is not
used outside of these implementations.
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This package contains the development headers for the library found in
libfs6. Non-developers likely have little use for this package.
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More information about X.Org can be found at:

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This module can be found at
git://anongit.freedesktop.org/git/xorg/lib/libFS