Linkage error for Linux package installation

Troubleshooting:cannot open shared object file: No such file or directory

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This advice applies to those people running an SVN version of myth, not the tarball or packaged versions.
If you see this:

/usr/local/bin/mythbackend: error while loading shared libraries:
libmyth-0.20.so.0.20.0: cannot open shared object file: No such file or directory

after updating myth, then you probably need to do the following:

sudo locate -u
locate libmyth-0.20.so.0.20.0

That will return something like

/home/mythtv/compile/svn/mythtv/libs/libmyth/libmyth-0.20.so.0.20.0
/usr/local/lib/libmyth-0.20.so.0.20.0

The first one (for me) was the path to the folder I compiled MythTV in. The 2nd line is the installed location of libmyth. I need to add the folder its in (in this case /usr/local/lib/). You need to append that to the end of /etc/ld.so.conf. For me, I would now execute as root

echo "/usr/local/lib" >> /etc/ld.so.conf
/sbin/ldconfig

If that doesn't work try make distclean, then configure, then make and make install.
If that all fails, try a fresh checkout of the svn repository, after deleting or moving your current checkout:

svn co http://svn.mythtv.org/svn/trunk/mythtv
svn co http://svn.mythtv.org/svn/trunk/mythplugins
svn co http://svn.mythtv.org/svn/trunk/myththemes

Then go through the usual build process (configure && make && make install).

Reference: http://www.mythtv.org/wiki/Troubleshooting:cannot_open_shared_object_file:_No_such_file_or_directory

The meaning of printf(_("Some Strings"))

This is related international programming and GNU i18n. _() can be identified as the Macro of gettext() function. More details can be found here:
http://en.wikipedia.org/wiki/GNU_gettext