gdImageGif errors

In follow-up to my bug report, here is the compiler output:

gmake[3]: Entering directory `/usr/local/src/php-4.0.6/ext/gd' /bin/sh /usr/local/src/php-4.0.6/libtool --silent --mode=compile gcc -I. -I/usr/local/src/php-4.0.6/ext/gd -I/usr/local/src/php-4.0.6/main -I/usr/local/src/php-4.0.6 -I/usr/apache/include/apache -I/usr/local/src/php-4.0.6/Zend -I/usr/local/include/freetype -I/usr/local/include/gd -I/usr/local/include -I/usr/local/include/c-client -I/usr/local/include/mysql -I/usr/local/src/php-4.0.6/ext/xml/expat/xmltok -I/usr/local/src/php-4.0.6/ext/xml/expat/xmlparse -I/usr/local/src/php-4.0.6/TSRM -DMOD_SSL=208104 -DEAPI -DUSE_EXPAT -DSUPPORT_UTF8 -DXML_BYTE_ORDER=12 -g -O2 -c gd.c gd.c: In function `php_if_imagegif': gd.c:1404: `gdImageGif' undeclared (first use in this function) gd.c:1404: (Each undeclared identifier is reported only once gd.c:1404: for each function it appears in.) gmake[3]: *** [gd.lo] Error 1 gmake[3]: Leaving directory `/usr/local/src/php-4.0.6/ext/gd' gmake[2]: *** [all-recursive] Error 1 gmake[2]: Leaving directory `/usr/local/src/php-4.0.6/ext/gd' gmake[1]: *** [all-recursive] Error 1 gmake[1]: Leaving directory `/usr/local/src/php-4.0.6/ext' gmake: *** [all-recursive] Error 1

I tried tweaking some other options (omitting), but it remains unaffected. I'm puzzled, because it seems to have compiled okay a while ago. Perhaps there were changes in the GD code that resulted in this bug. Thanks, Forrest (please CC me responses)