compiling PHP with jpeg-support

Hi. I'm trying to compile PHP with jpeg-support, but it doesn't seem to work. my configure-line looks like this: "./configure --with-apxs=/usr/local/apache/bin/apxs --with-ldap --with-mysql --with-gd --with-jpeg-dir=/usr --with-png --with-zlib --with-ttf" and when I run it I get: checking for libjpeg (needed by gd-1.8+)... yes checking for jpeg_read_header in -ljpeg... yes checking for gdImageCreateFromJpeg in -lgd... no imagePng() and imagettftext() is working, so PNG and Freetype is compiled in. imageJpeg(), how ever, does NOT work. Any ideas on how I can solve this problem? /Joakim