Hi!
IMHO musst du dein Projekt ebenfalls unter die GPL stellen sobald du Teile integrierst die ebenfalls unter die GPL fallen.
Gruß
Oliver
http://www.gnu.org/licenses/gpl-faq.html#IfLibraryIsGPL
If a library is released under the GPL (not the LGPL), does that mean that any program which uses it has to be under the GPL?
Yes, because the program as it is actually run includes the library.