I've had Cygwin installed on this computer for over two years
without any problems but recently I've started seeing a few problems
and my installation seems corrupted.

1.  Starting several weeks ago, whenever I run setup.exe I get this
    pop-up message part way through the process.

        Cygwin Setup - Running postinstall scripts

        Postinstall script errors
            These do not necessarily mean that affected packages
            will fail to function properly, but please check
            /var/log/setup.log.full and report any problems.

        Package: Unknown package
                 pango1.0.sh exit code 1

    The relevant lines from /var/log/setup.log.full (following a
    reinstall of the mutt package) seem to be these at the end:

        2013/06/21 10:05:29 running: C:\cygwin\bin\bash.exe --norc --noprofile "/etc/postinstall/mutt.sh"
        2013/06/21 10:05:30 running: C:\cygwin\bin\bash.exe --norc --noprofile "/etc/postinstall/pango1.0.sh"
        /etc/postinstall/pango1.0.sh: line 1: /etc/pango/pango.modules: No such file or directory
        2013/06/21 10:05:30 abnormal exit: exit code=1
        2013/06/21 10:05:30 Changing gid to Administrators
        2013/06/21 10:07:23 note: Installation Complete
        2013/06/21 10:07:23 Ending cygwin install

2.  I installed the ttrack time tracking tool from
    https://github.com/Cartroo/ttrack.  It initially worked fine.
    Following the running of setup.exe on Wednesday to bring my
    installation up to date, ttrack now generates these errors when
    started, but it seems to run fine.

        $ ttrack

        TimeTrack 1.1.0

        Type 'help' to list commands.

        ttrack>>> Exception in thread Thread-1:
        Traceback (most recent call last):
          File "/usr/lib/python2.7/threading.py", line 551, in __bootstrap_inner
            self.run()
          File "/usr/lib/python2.7/site-packages/ttrack-1.1.0-py2.7.egg/EGG-INFO/scripts/ttrack", line 288, in run
            updater = tracklib.LastSeenUpdater(self.__db)
          File "/usr/lib/python2.7/site-packages/ttrack-1.1.0-py2.7.egg/tracklib.py", line 380, in __init__
            self.conn = sqlite3.connect(db.filename)
        OperationalError: disk I/O error

3.  I ran "cygcheck -c" today to see what it might tell me.  It
    showed

        mutt                                  1.5.20-1             Incomplete

    so I ran setup.exe to reinstall the mutt package.  The package
    is still incomplete:

        $ cygcheck -cv mutt
        Cygwin Package Information
        Last downloaded files to: C:\Documents and Settings\gajohnso\Application Data\Cygwin
        Last downloaded files from: http://mirrors.kernel.org/sourceware/cygwin/

        Package              Version        Status
        Missing file: /etc/Muttrc.setupnew from package mutt
        Missing file: /etc/mime.types.setupnew from package mutt
        mutt                 1.5.20-1       Incomplete

4.  I ran "cygcheck -srv" which indicated several problems,
    including "Not found: gcc", so I tried reinstalling gcc but
    cygcheck still shows the same message.

Would someone please take a look at the attached output of "cygcheck
-srv" (including the messages to stderr) and let me know how I might
fix this mess?  (I sanitized it only to the extent of changing some
names to "MY...".)

I had been installing packages from kernel.org but changed to
osuosl.org in case the kernel.org repository had become corrupted,
but I didn't see any difference.

Regards,
Gary