NSA SELinux support is not set in Slackware kernels.
bash-4.2$ grep SELINUX config-*
config-generic-3.10.17:# CONFIG_SECURITY_SELINUX is not set
config-huge-3.10.17:# CONFIG_SECURITY_SELINUX is not set
And AFAIK PAM is not shipped in Slackware.
A bit of advice: when compiling your own kernel on Slackware, first take as a basis a config file provided by Slackware, run make oldconfig
, then customize it as need be.