depends zlib &&
depends autoconf &&

optional_depends pcre                         \
                 '--enable-dynamic-pcre'      \
                 '--disable-dynamic-pcre'     \
                 'PCRE (Perl regexp) support' &&
optional_depends docbook-dtd \
                 '--with-docbook=/usr/share/sgml/docbook/xml-dtd-4.2' \
                 '--without-docbook' \
                 'generation of docs'
