6.2 ate my headers

["Richard M. Pavonarius" <richard global-commons co jp>]

I upgraded from RedHat 6.1 to 6.2 and now I can't compile. Here's a sample:

[root linux php-4.0RC2]# make
Making all in Zend
make[1]: Entering directory `/usr/local/src/php-4.0RC2/Zend'
/bin/sh ../libtool --silent --mode=compile gcc -DHAVE_CONFIG_H -I. -I. -I.. 
-D
XML_BYTE_ORDER=12  -O2 -c zend-scanner.c
In file included from zend-scanner.c:29:
/usr/include/stdio.h:33: stddef.h: No such file or directory
/usr/include/stdio.h:38: stdarg.h: No such file or directory
In file included from /usr/include/stdio.h:40,
                 from zend-scanner.c:29:
/usr/include/bits/types.h:29: stddef.h: No such file or directory

I read the GCC HOWTO but I don't understand what I'm supposed to do to fix 
this problem.

Thanks,

Rich
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Richard M. Pavonarius, Global Commons, Inc., Tokyo