Setting up hiphop-php on Debian is not that easy because it uses patched versions of several libraries.
As a normal user run the following commands:
apt-get install cmake openssl \
g++ libmcrypt-dev libicu-dev \
libboost-dev binutils-dev libcap-dev \
flex bison libgd2-xpm-dev zlib1g-dev \
re2c libtbb-dev libonig-dev \
libmysqlclient-dev \
libxml2-dev libpcre3-dev git-core \
autoconf libtool libcurl4-openssl-dev \
libboost-system-dev libboost-program-options-dev \
libboost-filesystem-dev mkdir hiphop
cd hiphop
git clone https://github.com/facebook/hiphop-php
cd hiphop-php
export CMAKE_PREFIX_PATH=`/bin/pwd`/../
export HPHP_HOME=`/bin/pwd`
export HPHP_LIB=`/bin/pwd`/bin
git submodule init
git submodule update
cd .. wget http://www.monkey.org/~provos/libevent-1.4.14-stable.tar.gz
tar -xzvf libevent-1.4.14-stable.tar.gz
cd libevent-1.4.14-stable
cp ../hiphop-php/src/third_party/libevent-1.4.14.fb-changes.diff .
patch wget http://download.icu-project.org/files/icu4c/4.2.1/icu4c-4_2_1-src.tgz
tar -xvzf icu4c-4_2_1-src.tgz
cd icu/source
./configure --prefix=$CMAKE_PREFIX_PATH
make
make install
cd ../.. wget http://curl.haxx.se/download/curl-7.22.0.tar.gz
tar -xvzf curl-7.22.0.tar.gz
cd curl-7.22.0
cp ../hiphop-php/src/third_party/libcurl.fb-changes.diff .
patch -p1