##############################################################################
# INSTALL isolated PHP 5.6 ZTS (Thread-safe) with pthreads on Ubuntu 14.04 ###
##############################################################################

1) Install necessary bison version

  wget http://launchpadlibrarian.net/140087283/libbison-dev_2.7.1.dfsg-1_amd64.deb
  wget http://launchpadlibrarian.net/140087282/bison_2.7.1.dfsg-1_amd64.deb
  dpkg -i libbison-dev_2.7.1.dfsg-1_amd64.deb
  dpkg -i bison_2.7.1.dfsg-1_amd64.deb


2) Download PHP

  cd /usr/src
  git clone https://github.com/php/php-src
  cd php-src


2.a) Optionally check out speicific branch

  git checkout PHP-5.6


3) Download pthreads

  cd ext
  git clone https://github.com/krakjoe/pthreads
  cd ../


4) Compile

  ./buildconf --force
  ./configure --prefix=/opt/php-zts --with-config-file-path=/opt/php-zts/etc --enable-maintainer-zts --with-apxs2=/usr/bin/apxs --with-mysql --with-mysqli --enable-pthreads --enable-mbstring
  make -j8
  make install
  echo "extension=pthreads.so" > /opt/php-zts/modules.d/pthreads.ini


5) Symlinking

  ln -s /opt/php-zts/bin/php /usr/local/bin/php-zts
  ln -s /opt/php-zts/bin/phpize /usr/local/bin/phpize-zts
  ln -s /opt/php-zts/bin/php-config /usr/local/bin/php-config-zts
  ln -s /opt/php-zts/bin/php-cgi /usr/local/bin/php-cgi-zts
  ln -s /opt/php-zts/bin/phpdbg /usr/local/bin/phpdbg-zts


###################
# BUILD MODULES ###
###################

  cd /usr/src
  git clone https://github.com/krakjoe/apcu
  cd apcu
  phpize-zts
  ./configure --with-php-config=php-config-zts
  make -j8
  make install
  echo "extension=apcu.so" > /opt/php-zts/modules.d/apcu.ini





-- http://stackoverflow.com/questions/18033191/how-to-install-pthread-in-ubuntu-12-10