# configure smp for cgi usage here
AuthUserFile /path/to/your/.htpasswd
SetEnv SMPRC /path/to/your/.smprc

AuthType Basic
AuthName "smp cgi sms gateway"
Require valid-user

Options +ExecCGI
<Files smp>
    SetHandler cgi-script
</Files>

# optional, if you keep .smprc in this folder 
<Files .smprc>
    Deny from all
</files>