APC installation troubleshooting

APC stands for “Alternative PHP Cache”. APC is a free, open, and robust framework for caching and optimizing PHP intermediate code. This article shows common problems when installing APC and how to fix them.

1. Installing is as simple as

   [root@search ~]# pecl install apc
   [root@search ~]# echo "extension=apc.so" >  /etc/php.d/apc.ini

2. pcre.h: No such file or directory when installing APC (PHP extension)
   
   1. Error is as follows:

      /usr/include/php5/ext/pcre/php_pcre.h:29:18: error: pcre.h: No such file or directory

   2. To fix:

      yum install pcre-devel

3. Cannot execute on /tmp
   1. Error is as follows:

      shtool at '/tmp/APC/build/shtool' does not exist or is not executable. 
      Make sure that the file exists and is executable and then rerun this script.

   2. To fix: allow exec, and then disallow this permission on /tmp after installation

      mount -o remount,exec /tmp
      ....
      mount -o remount,noexec /tmp

4. sh: phpize: command not found
   1. yum install php-devel
5. no acceptable C compiler found in $PATH
   1. yum install gcc
6. Error related to specifier-qualifier-list before ‘pcre’:

   /var/tmp/APC/apc.c:449: error: expected specifier-qualifier-list before ‘pcre’
   /var/tmp/APC/apc.c: In function ‘apc_regex_compile_array’:
   /var/tmp/APC/apc.c:510: error: ‘apc_regex’ has no member named ‘preg’
   /var/tmp/APC/apc.c:510: error: ‘apc_regex’ has no member named ‘preg’
   /var/tmp/APC/apc.c:511: error: ‘apc_regex’ has no member named ‘nreg’
   /var/tmp/APC/apc.c:511: error: ‘apc_regex’ has no member named ‘nreg’
   /var/tmp/APC/apc.c: In function ‘apc_regex_match_array’:
   /var/tmp/APC/apc.c:552: error: ‘apc_regex’ has no member named ‘preg’
   /var/tmp/APC/apc.c:552: error: ‘apc_regex’ has no member named ‘preg’
   /var/tmp/APC/apc.c:553: error: ‘apc_regex’ has no member named ‘nreg’
   /var/tmp/APC/apc.c:553: error: ‘apc_regex’ has no member named ‘nreg’

   1. yum install pcre-devel