Cannot find header files under /usr???

when i tried to compile the latest PHP version i ran into problems.... here are the last lines that I see... checking size of char... 1 checking size of int... (cached) 4 checking size of long... (cached) 4 checking size of long long... 8 checking for size_t... (cached) yes checking whether time.h and sys/time.h may both be included... yes checking for uid_t in sys/types.h... (cached) yes checking for type ulong... yes checking for type uchar... no checking for type uint... yes checking for type ushort... yes checking for int8... no checking base type of last arg to accept... socklen_t checking return type of qsort... void configure: error: Cannot find header files under /usr and here is the configure line... root@Allowee:/home/Allowee/PHP/pack/php4.3# './configure' '--prefix=/usr' '--with-apxs=/usr/bin/apxs' '--with-config-file-path=/etc/php4/apache' '--disable-debug' '--enable-memory-limit' '--with-layout=GNU' '--enable-track-vars' '--enable-trans-sid' '--with-bz2' '--with-iconv' '--enable-ftp' '--with-gettext' '--enable-sockets' '--disable-xml' '--with-zlib' '--without-pgsql' '--with-gd' '--with-jpeg-dir=shared,/usr' '--with-png-dir=shared,/usr' '--with-freetype-dir=shared,/usr' '--with-mysql=shared,/usr' any ideas what I'm doing wrong? or do I miss some files? people please help me. I'm already trying to get it working for about 5 hours now. if there is any information you want please ask and i'll give it to you. Thanks, Allowee