Thank you Eduard, I supposed that the flag had something to do with the -j option and in fact I vaguely remember I must have seen that line in the context of explaining how to add that feature. Currently I'm not using multithreading for compiling so I wouldn't have noticed the difference.
In the Wiki page: http://wiki.inkscape.org/wiki/index.php/Compiling_Inkscape_on_Windows it's suggested to try the command without the -fopenmp option first and the the one with it only if the first fails: why should the first fail and not the second? Probably the line without the option should be the last one.
I suppose that the same can be applied to the 64bit version so the corresponding Wiki page should be updated too:
http://wiki.inkscape.org/wiki/index.php/Compiling_Inkscape_on_Windows_64-bit
Regards.
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