[SOLVED] Nginx on Slackware 15

Hi,

i cannot build nginx on Salckware 15 because libgd looks like missing.

Code:checking for OpenSSL library ... found
checking for zlib library ... found
checking for libxslt ... found
checking for libexslt ... found
checking for GD library ... not found
checking for GD library in /usr/local/ ... not found
checking for GD library in /usr/pkg/ ... not found
checking for GD library in /opt/local/ ... not found

./configure: error: the HTTP image filter module requires the GD library.
You can either do not enable the module or install the libraries.

Failures:
nginx: nginx.SlackBuild return non-zeroI expected to find it on slackbuilds.org but I cannot find it.
I removed the following option "--with-http_image_filter_module${DYNAMIC_MODULE}" and it worked.
Maybe should it be reviewed ?

Regards