I have followed the indication of Rasmus on the page ~rasmus/gd.html but, compiling php, have this problem:
gcc -I. -I/install/php-4.2.1/ext/gd -I/install/php-4.2.1/main -I/install/php-4.2.1 -I/install/apache_1.3.14/src/include -I/install/apache_1.3.14/src/os/unix -I/install/php-4.2.1/Zend -I/usr/local/include -I/usr/local/include/freetype2/freetype -I/install/libmcal -I/install/php-4.2.1/ext/mysql/libmysql -I/install/php-4.2.1/ext/xml/expat  -I/install/php-4.2.1/TSRM -g -O2  -c gd.c && touch gd.lo
gd.c: In function `zm_startup_gd':
gd.c:303: `gdArc' undeclared (first use in this function)
gd.c:303: (Each undeclared identifier is reported only once
gd.c:303: for each function it appears in.)
gd.c:304: `gdPie' undeclared (first use in this function)
gd.c:305: `gdChord' undeclared (first use in this function)
gd.c:306: `gdNoFill' undeclared (first use in this function)
gd.c:307: `gdEdged' undeclared (first use in this function)
gd.c: In function `zif_imagecreatetruecolor':
gd.c:588: warning: assignment makes pointer from integer without a cast
gd.c: In function `zif_imagecolorat':
gd.c:1626: structure has no member named `tpixels'
make[3]: *** [gd.lo] Error 1
make[3]: Leaving directory `/install/php-4.2.1/ext/gd'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/install/php-4.2.1/ext/gd'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/install/php-4.2.1/ext'
make: *** [all-recursive] Error 1

My configuration script:
./configure --prefix=/usr --with-apxs=/usr/sbin/apxs --with-gd=../gd-2.0.1 --enable-safe-mode --with-config-file-path=/etc/httpd --with-exec-dir=/usr/bin --enable-magic-quotes --with-regex=system --with-ttf=/usr/lib/libttf.so --enable-track-vars --enable-xml --disable-debug --with-ldap --with-imap --enable-ftp --with-mysql --with-mcal=../libmcal --with-pdflib --with-curl --with-zlib --with-jpeg-dir=../jpeg-6b --with-tiff-dir --with-freetype-dir --enable-gd-native-ttf --enable-gd-imgstrttf --with-png-dir