[Inkscape-user] effects in Ubuntu

Hello, I have a problem with extensions in Ubuntu. I am compiling the source in ubuntu because I would like to do a modification. The problem is that I add my files .inx and .py in the directory /inkscape-0.45.1/share/extensions/ but when I open inkscape I can't see them. It works fine in windows, I don't know if I must do something else in order to it works out in Ubuntu.

Thanks for your help.

Pilar.