CentOS 5.6 32 bit で The Silver Searcher(ag) をソースからインストール

CentOS ack ag 
$ cat /etc/redhat-release
CentOS release 5.6 (Final)
$ uname -srmpi
Linux 2.6.18-238.19.1.el5 i686 i686 i386
$ sudo yum -y groupinstall "Development Tools"
$ sudo yum -y install pcre-devel xz-devel
$ git clone git://github.com/ggreer/the_silver_searcher.git
$ cd the_silver_searcher
$ ./build.sh
$ sudo make install