I've set up a repository containing libfixposix(and in future other C libraries on which IOLib depends), currently available only for Debian and Ubuntu(RH & co. coming soon)
To enable it on your system add to /etc/apt/sources.list:
deb http://download.opensuse.org/repositories/home:/sionescu/DISTRO/ ./
and to /etc/apt/preferences:
Package: libfixposix* Pin: origin download.opensuse.org Pin-Priority: 1001
Replace DISTRO with Debian_Squeeze, Ubuntu_Natty or Ubuntu_Oneiric