since marbleWidget->setMapThemeId() assums 'data' directory exists in the executable directory, it causes unefficiency in my work -
I have 'windows' and 'linux' directories, and each one has 'debug' and 'release' directories, so theoretically, I need to copy the 'data' directory (which holds the maps) in 4 copies. is there a way to define somhow the location of the 'data' directory, so I wont need so much copies?

thank you

Ok.. I found the solution:
by using "MarbleDirs::setMarbleDataPath" from MarbleDirs.h.