PHP 4.3.1 Compiliation - RHL9

Hi, I'm trying to compile PHP 4.3.1 on a RedHat 9 machine. I get the following error: checking return type of qsort... void configure: error: Cannot find header files under /usr when using the following configure script: ./configure --program-prefix= --prefix=/usr --exec-prefix=/usr --bindir=/usr/bin --sbindir=/usr/sbin --sysconfdir=/etc --datadir=/usr/share --includedir=/usr/include --libdir=/usr/lib --libexecdir=/usr/libexec --localstatedir=/var --sharedstatedir=/usr/com --mandir=/usr/share/man --infodir=/usr/share/info --cache-file=../config.cache --with-config-file-path=/etc --with-config-file-scan-dir=/etc/php.d --enable-force-cgi-redirect --disable-debug --enable-pic --disable-rpath --enable-inline-optimization --with-db3 --with-curl --with-dom=/usr --with-exec-dir=/usr/bin --with-freetype-dir=/usr --with-png-dir=/usr --with-gd --enable-gd-native-ttf --with-ttf --with-gdbm --with-gettext --with-ncurses --with-gmp --with-iconv --with-jpeg-dir=/usr --with-zlib --with-layout=GNU --enable-bcmath --enable-exif --enable-ftp --enable-magic-quotes --enable-safe-mode --enable-sockets --enable-sysvsem --enable-sysvshm --enable-discard-path --enable-track-vars --enable-trans-sid --with-mysql=shared,/usr --with-pgsql=shared --with-unixODBC=shared --enable-memory-limit Any suggestions? -Michael -- Michael Smith <msmith@custom87.net> Custom87.net