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/usr/share/doc/libmama-dev/README.Debian is in libmama-dev 2.2.2.1-11.1ubuntu1.

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Note:

Upstream installs some files to INCDIR without using a package
name prefix.  This works fine for installing to a dedicated
tree such as /opt/openmama/include but is not good for
installing to /usr/include

This means that some of these files, such as platform.h, are
installed to /usr/include

As a workaround:

- those files are installed to /usr/include/wombat-c

- users of this package need to add -I/usr/include/wombat-c
  to their CPPFLAGS when compiling