www/nginx-devel: DAV modules requires xslt

adding module in /www/nginx-devel/work/nginx-dav-ext-module-3.0.0
+ ngx_http_dav_ext_module was configured
checking for PCRE library ... found
checking for PCRE JIT support ... found
checking for OpenSSL library ... found
checking for zlib library ... found
checking for libxslt ... not found
checking for libxslt in /usr/local/ ... not found
checking for libxslt in /usr/pkg/ ... not found
checking for libxslt in /opt/local/ ... not found
./configure: error: the HTTP XSLT module requires the libxml2/libxslt
libraries. You can either do not enable the module or install the libraries.