Log Message:
Update to 6.3.4:

Version 6.3.4 - February 2 2015

[FIXED BUGS]
o global: Global(1) exited with a message "Abbrev character must be
  a lower alphabetic character ()" in some condition. Now it is fixed.
o gozilla/Makefile.am: Installation made a directory outside of the DESTDIR.
  Now it is fixed.
o gtags: The C++ parser picked up compiler specific macros as a class name.
  It is not desirable. Now it is fixed.