Problems compiling in GD Support

Hello all, I have been running PHP 4.0 for quite some time now and have had no problems with it at all. However a new project that I am working on requires GD support to be compiled in. When I go to do so I get: gd.c: In function `php_if_imagecreatefromgif': gd.c:472: `gdImageCreateFromGif' undeclared (first use in this function) gd.c:472: (Each undeclared identifier is reported only once gd.c:472: for each function it appears in.) gd.c: In function `php_if_imagegif': gd.c:629: `gdImageGif' undeclared (first use in this function) make[3]: *** [gd.lo] Error 1 make[3]: Leaving directory `/home/dan/php4/php-4.0.1pl2/ext/gd' make[2]: *** [all-recursive] Error 1 make[2]: Leaving directory `/home/dan/php4/php-4.0.1pl2/ext/gd' make[1]: *** [all-recursive] Error 1 make[1]: Leaving directory `/home/dan/php4/php-4.0.1pl2/ext' make: *** [all-recursive] Error 1 Does anyone have any ideas on such a thing. Thanks in advance. Dan