I'm new to this, so maybe I've been doing something wrong.  It seems to be compiling okay now (see the end of this text)

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

commenting out the #ifdef like this seemed to help:

PHP_FUNCTION(imagecreatefromgif)
{
//#ifdef HAVE_GD_GIF
//	_php_image_create_from(INTERNAL_FUNCTION_PARAM_PASSTHRU, PHP_GDIMG_TYPE_GIF, "GIF", gdImageCreateFromGif);
//#else /* HAVE_GD_GIF */
	php_error(E_WARNING, "ImageCreateFromGif: No GIF support in this PHP build");
	RETURN_FALSE;
//#endif /* HAVE_GD_GIF */
}

PHP_FUNCTION(imagegif)
{
//#ifdef HAVE_GD_GIF
//	_php_image_output(INTERNAL_FUNCTION_PARAM_PASSTHRU, PHP_GDIMG_TYPE_GIF, "GIF", gdImageGif);
//#else /* HAVE_GD_GIF */
	php_error(E_WARNING, "ImageGif: No GIF support in this PHP build");
	RETURN_FALSE;
//#endif /* HAVE_GD_GIF */
}