Hi folks,
I posted my problem in the debian-glibc mailing list, and Goto Masanori answered a few lines completely solving my problem. You need tmpfs mounted at /dev/shm. Probably most people have this, I didn't, as I didn't want to waste ressources and I didn't see the consequences. So, if anyone has the same problem as me:
1. If your 2.6 kernel lacks tmpfs support, compile & install one who has it (the option is to be found under "Device drivers -> Pseudo filesystems -> Virtual memory file system support (former shm fs)"
2. Mount tmpfs by including this line in /etc/fstab
tmpfs /dev/shm tmpfs defaults 0 0
and having a "mount /dev/shm" automatically in the start scripts or manually.
Although some otherwise nice texts in the internet like this[1] claim that you don't need to have /dev/shm mounted to have named semaphores, at least my systems really needs it mounted. The second I unmounted it I got the familiar "function not implemented".
Merry Christmas and Happy New Year everybody! Viktor.
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