Confusion regarding PHP compile error

Hello, I'm on a Mandrake 7.0 system, running kernel 2.4.2. While attempting the compile PHP 4.0.3pl1, I'm getting this familiar message. microtime.c: In function `php_if_getrusage': microtime.c:97: storage size of `usg' isn't known microtime.c:100: `RUSAGE_SELF' undeclared (first use in this function) microtime.c:100: (Each undeclared identifier is reported only once microtime.c:100: for each function it appears in.) microtime.c:106: `RUSAGE_CHILDREN' undeclared (first use in this function) make[3]: *** [microtime.lo] Error 1 make[3]: Leaving directory `/home/source/web_and_database/php-4.0.3pl1/ext/standard' make[2]: *** [all-recursive] Error 1 make[2]: Leaving directory `/home/source/web_and_database/php-4.0.3pl1/ext/standard' make[1]: *** [all-recursive] Error 1 make[1]: Leaving directory `/home/source/web_and_database/php-4.0.3pl1/ext' make: *** [all-recursive] Error 1 I thought I knew the cause of this, since I saw it before while attempting to compile PHP under a 2.2 kernel. However, I have checked my /usr/include/linux symlink, and this appears to be correct, so I do not understand why I am getting the error. I hope that this illustrates this: [chris@localhost chris]$ uname -sr Linux 2.4.2 [chris@localhost chris]$ ls -l /usr/include/linux lrwxrwxrwx 1 root root 26 Jan 7 16:13 /usr/include/linux -> ../src/linux/include/linux/ [chris@localhost chris]$ ls -l /usr/src/linux lrwxrwxrwx 1 root root 11 Feb 24 20:00 /usr/src/linux -> linux-2.4.2/ Anybody any ideas what's causing this? Could it be that I'm running a 2.4 rather than 2.2 kernel? I do have the glibc-devel packages installed. I notice that the README for 2.4 says: Do NOT use the /usr/src/linux area! This area has a (usually incomplete) set of kernel headers that are used by the library header files. They should match the library, and not get messed up by whatever the kernel-du-jour happens to be. Whilst the README for 2.2 says: - If you install the full sources, do a cd /usr/src gzip -cd linux-2.2.XX.tar.gz | tar xfv - to get it all put in place. Replace "XX" with the version number of the latest kernel. Cheers, -- Chris Howells E-Mail: chrish@gmx.co.uk ICQ: 93699029 Web: http://www.chowells.uklinux.net