Binary package “libxmu-headers” in ubuntu focal

X11 miscellaneous utility library headers

 libXmu and libXmuu are miscellaneous utility libraries for X library
 developers to abstract some common functions. This package provides the
 headers for both libraries (as libXmuu is a subset of libXmu), and
 is depended upon by both. For more information, please see libxmu-dev or
 libxmuu-dev.
 .
 More information about X.Org can be found at:
 <URL:http://www.X.org>
 .
 This module can be found at
 git://anongit.freedesktop.org/git/xorg/lib/libXmu