Open Sound System

I got 6.0-RELEASE FreeBSD and trying to install oss3993c-freebsd-x86-v6.0-RELEASE.tar.gz on it. I got strange problem # sh ./oss-install ./oss-install: 1: Syntax error: "(" unexpected What can it be... may be it is because of my kernel configuration... or some permisions set in devfs.c...