Multithreaded make with make -j

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Compile the sources with the option make -j#NUM with #NUM>=2
2.
3.

What is the expected output? What do you see instead?
Instead of a well compiled program
gen68k.c:8:25: fatal error: def68k-iibs.h: No such file or directory

What version of the product are you using? On what operating system?
on Arch Linux gngeo-0.8 from the AUR

Please provide any additional information below.
https://aur.archlinux.org/packages/gngeo/

Original issue reported on code.google.com by Florian....@gmail.com on 21 May 2013 at 3:15

[GoogleCodeExporter]

multithreaded make is not supported for now. I need to rework the dependencies 

Original comment by m.peponas@gmail.com on 29 May 2013 at 8:17