The definitions of errno in qmail do not work with the newer glibc (2.3.1).
Executables compiled with older glibc's (2.3) abort on startup, and
recompilation with 2.3.1 is not possible. These patches allow qmail and other
DJB software to compile. By Mate Wierdl.

http://djbware.csi.hu/patches/qmail-1.03.errno.patch