SOLUTION: Apache 2.0 SSL and RedHat
Didn't find this anywhere else, so I thought I'd put it here:
I Couldn't compile SSL components for Apache 2. Found that mod_ssl.h was requesting a symbol from "err.h" which is part of the openssl package. However, RedHat ships with an err.h for other purposes in the default include path.
/usr/include/err.h <wrong one>
/usr/include/openssl/err.h <right one>
On line 126 - changed this:
This may be related to my tendancy of installing redhat as "EVERYTHING", instead of carefully picking packages, but regardless - this seems to work if anybody else runs into this issue.