optional_depends gettext \ "--enable-nls" \ "--disable-nls" \ "for Native Language Support" && optional_depends tcl \ "--with-tcl" \ "--without-tcl" \ "for PL/Tcl support" && optional_depends perl \ "--with-perl" \ "--without-perl" \ "for PL/Perl support" && optional_depends python \ "--with-python" \ "--without-python" \ "for PL/Python support" && optional_depends linux-pam \ "--with-pam" \ "--without-pam" \ "for PAM authentication" && optional_depends libselinux \ "--with-selinux" \ "--without-selinux" \ "for SELinux support" && optional_depends krb5 \ "--with-gssapi" \ "--without-gssapi" \ "for Kerberos (GSSAPI) authentication" && optional_depends openldap \ "--with-ldap" \ "--without-ldap" \ "for LDAP authentication" && optional_depends readline \ "--with-readline" \ "--without-readline" \ "for Readline support in psql, the command line interface" && optional_depends SSL \ "--with-openssl" \ "--without-openssl" \ "for SSL (encrypted) connection support" && optional_depends libxml2 \ "--with-libxml" \ "--without-libxml" \ "for XML support (XML data type)" && if is_depends_enabled $SPELL libxml2; then optional_depends libxslt \ "--with-libxslt" \ "--without-libxslt" \ "for XSLT support" fi && optional_depends zlib \ "--with-zlib" \ "--without-zlib" \ "for compression support in the pg_dump and pg_restore utilities"