Problems running configure (locks up)

Hey there, I've run PHP for a long while now, and just went to compile 4.3.1 and had a problem. I'm running on Solaris 2.8, and unpacked php 4.3.1, ran the following configure, and got the following ouput:

configure --with-apxs=/var/html/apache/bin/apxs --with-gd --with-jpeg-d=/opt/X11R5 --with-ttf --enable-gd-native-ttf --with-mysql --with-config-file-path=/var/html/apache/php --disable-posix --disable-session --disable-ctype --prefix=/var/html/apache/php

loading cache ./config.cache checking for Cygwin environment... no checking for mingw32 environment... no checking for working sed... sed checking host system type... sparc-sun-solaris2.8 At that point, it just completely hangs. Nothing else happens, it just sits there. Never had this problem before with previous versions. Any thoughts? Eli