automoc generates wrong #includes for projects in a symlinked path

project "kig" uses cmake and automoc. My local copy of the git
sources are located in a folder that I reach following a symlink
(it resides in a local partition whereas my home is on an NFS-mounted filesystem).

after a cmake and then a "make", the generated "moc*" files contain
an "#include" like this:

#include "../../../../../misc/euclide/paolini/Git/kdeedu/kig/modes/popup/popup.h"

There is a wrong number of ".." and the path does not work.
using "make VERBOSE=1 kigpart_automoc" I noticed the following command is issued:

/usr/lib/qt5/bin/moc -I/home/matem/paolini/Git/kdeedu/kig/modes [...] -o /home/matem/paolini/Git/kdeedu/kig/moc_popup.cpp /home/misc/euclide/paolini/Git/kdeedu/kig/modes/popup/popup.h

where the [...] part contains many more -I and various options. Notice that "/home/matem/paolini/Git/" and "/home/misc/euclide/paolini/Git/" point to the same place, the first through the symlink "Git", the second is the physical path.
I guess that then "moc" tries hard to walk (with a relative path) from
one path to the other, but there is no way to successfully climb up
a path with a symlink in it using the ".." directory.

I am new to automoc, so no idea where the problem is.

I previously opened a kde bug for this issue:
https://bugs.kde.org/show_bug.cgi?id=360611