All of sudden, cmake(cpack) started producing wrong debian packages for one 
project.
This is the output of debian package manager:

        dpkg: warning: downgrading lyx24 from 2.4.0-50424git-g3a4b233 to 
2.4.0-50422git-gd6fb2ab
        (Reading database ... 422667 files and directories currently installed.)
        Preparing to unpack lyx24-2.4.0-50422git-Linux.deb ...
        Unpacking lyx24 (2.4.0-50422git-gd6fb2ab) over 
(2.4.0-50424git-g3a4b233) ...
        dpkg: error processing archive lyx24-2.4.0-50422git-Linux.deb 
(--install):
         corrupted filesystem tarfile - corrupted package archive
        dpkg-deb: error: subprocess paste was killed by signal (Broken pipe)
        Errors were encountered while processing:
         lyx24-2.4.0-50422git-Linux.deb

Analysing the data.tar.gz gives no hint. What helps is a sequence of commands 
using the system's 'tar'.

        # ar xv  lyx24-2.4.0-50422git-Linux.deb  data.tar.gz
        # sudo tar axf data.tar.gz
        # tar cf data.tar ./usr
        # gzip -f data.tar
        # ar rv  lyx24-2.4.0-50422git-Linux.deb  data.tar.gz

Now everything is OK.
Other projects do not show this behaviour. 
This is cmake 3.10.20171229-g3e1f5b11, but the same happens with earlier 
version.

        Kornel

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