sudo yum -y -q install pcre-devel pcre-static
sudo yum -y -q install git-core
sudo yum -y -q install ruby ruby-devel
-sudo yum -y -q install libunwind
+sudo yum -y -q install libunwind libunwind-devel
which_svn=`which svn` #svn necessary
which_gcc=`which gcc` #gcc gcc necessary