depends -sub CXX gcc && depends zlib && optional_depends perl '' '' 'for CGI script' && optional_depends 'clamav' \ '--enable-clamd' \ '' \ 'for Clamd AV content scanner' && optional_depends 'pcre' \ '--enable-pcre' \ '--disable-pcre' \ 'for PCRE support' && optional_depends 'libntlm' \ '--enable-ntlm' \ '--disable-ntlm' \ 'for NTLM auth support' && if list_find "${DG_OPTS}" "--enable_email"; then depends 'MAIL-TRANSPORT-AGENT' fi .