Download page:
http://php-fpm.org/Download

Direct link:
http://php-fpm.org/downloads/php-5.3.0-fpm-0.5.12-rc.diff.gz

It compiles flawlessly and I tried hammering my own local machine and
things seem to work properly.

However, there are a ton of PHP extensions and configurations out
there, so test away. I was not able to try Suhosin with it as they
don't have a patch out yet (at least for PHP core)

For the record this is my build script:

#!/bin/bash
VER=5.3.0
BD=`pwd`

rm -rf php-${VER}
tar xvfz php-${VER}.tar.gz
cd php-${VER}

wget http://php-fpm.org/downloads/php-${VER}-fpm-0.5.12-rc.diff.gz
gunzip php-${VER}-fpm-0.5.12-rc.diff.gz
patch -p1 < php-${VER}-fpm-0.5.12-rc.diff

./configure \
--enable-fpm \
--with-fpm-pid=/var/run/php-fpm.pid \
--with-fpm-log=/var/log/php-fpm.log \
--with-fpm-conf=/etc/php-fpm.conf \
--with-zend-vm=GOTO \
--enable-cli \
--enable-inline-optimization \
--disable-threads \
--disable-rpath \
--disable-ipv6 \
--enable-mbstring \
--enable-mbregex \
--with-libmbfl \
--enable-sqlite-utf8 \
--with-gettext \
--with-mysql=mysqlnd \
--with-mysqli=mysqlnd \
--disable-pdo \
--enable-intl \
--with-curl \
--with-curlwrappers \
--with-zlib \
--with-gd \
--with-jpeg-dir=/usr \
--with-png-dir=/usr \
--with-freetype-dir \
--enable-gd-native-ttf \
--with-xpm-dir=/usr \
--enable-exif=shared \
--enable-shmop=shared \
--with-xsl=shared \
--with-mssql=shared \
--enable-soap=shared \
--enable-sockets \
--enable-pcntl=shared \
--with-mcrypt \
--with-bz2 \
--with-tidy=shared \
--with-pcre-dir \
--with-pcre-regex \
--with-openssl \
--with-imap=shared \
--with-imap-ssl \
--with-kerberos \
--with-pear \
--with-gmp
make -j4
make test