Contents: gzip-1.3.12.tar: gzip source code for those missing gzip. Unpack by running "tar xf gzip-1.3.12.tar" bsdi_skey.h: skey.h for BSD/OS 2.1. The binary distribution of BSD/OS 2.1 doesn't include an skey.h. If installed, this skey.h will allow you to compile in s/key support for sudo on BSD/OS 2.1.