configure fails with gd

configure: error: Unable to find gd.h anywhere under php ./configure --with-apxs2=/usr/sbin/apxs --with-mysql=/usr --enable-track-vars --enable-ftp --enable-imap --enable-ssl --enable-versioning --enable-trans-sid --enable-sysvsem --with-config-file-path=/etc --with-jpeg-dir=/usr --with-png-dir=/usr --with-zlib-dir=/usr --with-xml --with-ttf=/usr --with-gd=php --enable-xslt --with-xslt-sablot=/usr --with-sablot-js=/usr --with-dom regards Kevin -- Please avoid sending me Word or PowerPoint attachments. See http://www.fsf.org/philosophy/no-word-attachments.html Kevin Waterson Byron Bay, Australia