sys-apps/realtime-lsm 0.8.2_pre20041022 incorrectly assumes that SELinux support is required. the check for SELinux support needs to be removed, as it is a misunderstanding and not strictly required. see http://www.nsa.gov/selinux/list-archive/0406/7485.cfm for full disclosure.
Created attachment 43028 [details, diff] v1, realtime-lsm_0.8.2pre20041022_ebuild_noSELinux.patch diff against ./realtime-lsm/ to remove SELinux check from ebuild
Thanks for the report. I contacted the author of the module to let him know as well. Fixes show up in reported version, as well as new released version 0.8.3.