OpenBSD 4.8 switched to gcc4 as mentioned below:
http://www.openbsd.org/48.html
As
BSDfan666 explains, this may lead to incompatibilities due to new binary startup code, library changes, & other differences in how binaries are structured in memory.
If you compiled these tools before, you will need to do so again. If you downloaded binaries before, you will need to determine whether anything downloaded now is compiled with a new compiler version. If not, you will be running into the same problem.