title: Error while installing APC
body: <p>I am getting following error while installing APC</p>
  
  <p>I also followed the guidelines mentioned at <a href="https://wiki.bitnami.com/Components/PHP#How_to_install_APC_module.3f" rel="noreferrer">https://wiki.bitnami.com/Components/PHP#How_to_install_APC_module.3f</a> but same error.</p>
  
  <p>I am trying to install it in a Bitnami Image for Wordpress in Google App Engine.</p>
  
  <pre><code>         pecl install apc
          WARNING: configuration download directory "/tmp/pear/download" is not writeable.  Change download_dir config variable to a writeable dir to avoid this warning
          Cannot install, php_dir for channel "pecl.php.net" is not writeable by the current user
          user@edudrona-prod-vm:~$ sudo pecl install apc
          downloading APC-3.1.13.tgz ...
          Starting to download APC-3.1.13.tgz (171,591 bytes)
          .....................................done: 171,591 bytes
          55 source files, building
          running: phpize
          Configuring for:
          PHP Api Version:         20151012
          Zend Module Api No:      20151012
          Zend Extension Api No:   320151012
          Enable internal debugging in APC [no] :
          Enable per request file info about files used from the APC cache [no] :
          Enable spin locks (EXPERIMENTAL) [no] :
          Enable memory protection (EXPERIMENTAL) [no] :
          Enable pthread mutexes (default) [no] :
          Enable pthread read/write locks (EXPERIMENTAL) [yes] :
          building in /tmp/pear/temp/pear-build-rootJudBGM/APC-3.1.13
          running: /tmp/pear/temp/APC/configure --with-php-config=/opt/bitnami/php/bin/php-config --enable-apc-debug=no --enable-apc-filehits=no --enable-apc-spinlocks=no --enable-apc-memprotect=no --enable-apc-pthreadmutex=no --enable-apc-pthreadrwlocks=yes
          checking for grep that handles long lines and -e... /bin/grep
          checking for egrep... /bin/grep -E
          checking for a sed that does not truncate output... /bin/sed
          checking for cc... cc
  
          checking whether the C compiler works... yes
          checking for C compiler default output file name... a.out
          checking for suffix of executables...
          checking whether we are cross compiling... no
          checking for suffix of object files... o
          checking whether we are using the GNU C compiler... yes
  
          checking whether cc accepts -g... yes
          checking for cc option to accept ISO C89... none needed
          checking how to run the C preprocessor... cc -E
          checking for icc... no
          checking for suncc... no
          checking whether cc understands -c and -o together... yes
          checking for system library directory... lib
          checking if compiler supports -R... no
          checking if compiler supports -Wl,-rpath,... yes
          checking build system type... x86_64-unknown-linux-gnu
          checking host system type... x86_64-unknown-linux-gnu
          checking target system type... x86_64-unknown-linux-gnu
          checking for PHP prefix... /opt/bitnami/php
          checking for PHP includes... -I/opt/bitnami/php/include/php -I/opt/bitnami/php/include/php/main -I/opt/bitnami/php/include/php/TSRM -I/opt/bitnami/php/include/php/Zend -I/opt/bitnami/php/include/php/ext -I/opt/bitnami/php/include/php/ext/date/lib
          checking for PHP extension directory... /opt/bitnami/php/lib/php/extensions
          checking for PHP installed headers prefix... /opt/bitnami/php/include/php
          checking if debug is enabled... no
          checking if zts is enabled... no
          checking for re2c... re2c
          checking for re2c version... 0.13.5 (ok)
          checking for gawk... gawk
          checking whether to enable APC support... yes, shared
          checking whether we should enable cache request file info... no
          checking whether we should use mmap... yes
          checking whether we should use semaphore locking instead of fcntl... no
          checking whether we should use pthread mutex locking... no
          checking whether we should use pthread read/write locking... yes
          pthread rwlocks are supported!
          checking whether the target compiler supports builtin atomics... yes
          checking whether we should use spin locks... no
          checking whether we should enable memory protection... no
          checking for zend_set_lookup_function_hook... no
          checking for sigaction... yes
          checking for union semun... no
          checking whether we should enable valgrind support... checking for ANSI C header files... yes
          checking for sys/types.h... yes
          checking for sys/stat.h... yes
          checking for stdlib.h... yes
          checking for string.h... yes
          checking for memory.h... yes
          checking for strings.h... yes
          checking for inttypes.h... yes
          checking for stdint.h... yes
          checking for unistd.h... yes
          yes
          checking valgrind/memcheck.h usability... no
          checking valgrind/memcheck.h presence... no
          checking for valgrind/memcheck.h... no
          checking for shm_open in -lrt... yes
          checking whether to include code coverage symbols... no
          checking for ld used by cc... /usr/bin/ld
          checking if the linker (/usr/bin/ld) is GNU ld... yes
          checking for /usr/bin/ld option to reload object files... -r
          checking for BSD-compatible nm... /usr/bin/nm -B
          checking whether ln -s works... yes
          checking how to recognize dependent libraries... pass_all
          checking dlfcn.h usability... yes
          checking dlfcn.h presence... yes
          checking for dlfcn.h... yes
          checking the maximum length of command line arguments... 1572864
          checking command to parse /usr/bin/nm -B output from cc object... ok
          checking for objdir... .libs
          checking for ar... ar
          checking for ranlib... ranlib
          checking for strip... strip
          checking if cc supports -fno-rtti -fno-exceptions... no
          checking for cc option to produce PIC... -fPIC
          checking if cc PIC flag -fPIC works... yes
          checking if cc static flag -static works... yes
          checking if cc supports -c -o file.o... yes
          checking whether the cc linker (/usr/bin/ld -m elf_x86_64) supports shared libraries... yes
          checking whether -lc should be explicitly linked in... no
          checking dynamic linker characteristics... GNU/Linux ld.so
          checking how to hardcode library paths into programs... immediate
          checking whether stripping libraries is possible... yes
          checking if libtool supports shared libraries... yes
          checking whether to build shared libraries... yes
          checking whether to build static libraries... no
  
          creating libtool
          appending configuration tag "CXX" to libtool
          configure: creating ./config.status
          config.status: creating config.h
          running: make
          /bin/bash /tmp/pear/temp/pear-build-rootJudBGM/APC-3.1.13/libtool --mode=compile cc -D_GNU_SOURCE -I. -I/tmp/pear/temp/APC -DPHP_ATOM_INC -I/tmp/pear/temp/pear-build-rootJudBGM/APC-3.1.13/include -I/tmp/pear/temp/pear-build-rootJudBGM/APC-3.1.13/main -I/tmp/pear/temp/APC -I/opt/bitnami/php/include/php -I/opt/bitnami/php/include/php/main -I/opt/bitnami/php/include/php/TSRM -I/opt/bitnami/php/include/php/Zend -I/opt/bitnami/php/include/php/ext -I/opt/bitnami/php/include/php/ext/date/lib  -DHAVE_CONFIG_H  -I/opt/bitnami/common/include   -c /tmp/pear/temp/APC/apc.c -o apc.lo
          mkdir .libs
           cc -D_GNU_SOURCE -I. -I/tmp/pear/temp/APC -DPHP_ATOM_INC -I/tmp/pear/temp/pear-build-rootJudBGM/APC-3.1.13/include -I/tmp/pear/temp/pear-build-rootJudBGM/APC-3.1.13/main -I/tmp/pear/temp/APC -I/opt/bitnami/php/include/php -I/opt/bitnami/php/include/php/main -I/opt/bitnami/php/include/php/TSRM -I/opt/bitnami/php/include/php/Zend -I/opt/bitnami/php/include/php/ext -I/opt/bitnami/php/include/php/ext/date/lib -DHAVE_CONFIG_H -I/opt/bitnami/common/include -c /tmp/pear/temp/APC/apc.c  -fPIC -DPIC -o .libs/apc.o
          In file included from /tmp/pear/temp/APC/apc_main.h:38:0,
                           from /tmp/pear/temp/APC/apc_compile.h:43,
                           from /tmp/pear/temp/APC/apc_cache.h:40,
                           from /tmp/pear/temp/APC/apc.c:36:
          /tmp/pear/temp/APC/apc_serializer.h: In function ‘apc_register_serializer’:
          /tmp/pear/temp/APC/apc_serializer.h:45:33: warning: passing argument 1 of ‘zend_get_constant’ from incompatible pointer type
           #define APC_SERIALIZER_CONSTANT "\000apc_register_serializer-" APC_SERIALIZER_ABI
                                           ^
          /tmp/pear/temp/APC/apc_serializer.h:64:27: note: in expansion of macro ‘APC_SERIALIZER_CONSTANT’
               if (zend_get_constant(APC_SERIALIZER_CONSTANT, sizeof(APC_SERIALIZER_CONSTANT)-1, &amp;apc_magic_constant TSRMLS_CC)) {
                                     ^
          In file included from /opt/bitnami/php/include/php/main/php.h:396:0,
                           from /tmp/pear/temp/APC/apc.h:61,
                           from /tmp/pear/temp/APC/apc.c:34:
          /opt/bitnami/php/include/php/Zend/zend_constants.h:68:16: note: expected ‘struct zend_string *’ but argument is of type ‘char *’
           ZEND_API zval *zend_get_constant(zend_string *name);
                          ^
          In file included from /tmp/pear/temp/APC/apc_main.h:38:0,
                           from /tmp/pear/temp/APC/apc_compile.h:43,
                           from /tmp/pear/temp/APC/apc_cache.h:40,
                           from /tmp/pear/temp/APC/apc.c:36:
          /tmp/pear/temp/APC/apc_serializer.h:64:9: error: too many arguments to function ‘zend_get_constant’
               if (zend_get_constant(APC_SERIALIZER_CONSTANT, sizeof(APC_SERIALIZER_CONSTANT)-1, &amp;apc_magic_constant TSRMLS_CC)) {
                   ^
          In file included from /opt/bitnami/php/include/php/main/php.h:396:0,
                           from /tmp/pear/temp/APC/apc.h:61,
                           from /tmp/pear/temp/APC/apc.c:34:
          /opt/bitnami/php/include/php/Zend/zend_constants.h:68:16: note: declared here
           ZEND_API zval *zend_get_constant(zend_string *name);
                          ^
          In file included from /tmp/pear/temp/APC/apc.c:36:0:
          /tmp/pear/temp/APC/apc_cache.h: At top level:
          /tmp/pear/temp/APC/apc_cache.h:136:9: error: unknown type name ‘zend_uint’
                   zend_uint *exec_refcount;   /* refcount member of zend_op_array refreshed before execution */
                   ^
          /tmp/pear/temp/APC/apc.c:47:43: fatal error: ext/standard/php_smart_str.h: No such file or directory
           #   include "ext/standard/php_smart_str.h"
                                                     ^
          compilation terminated.
          Makefile:195: recipe for target 'apc.lo' failed
          make: *** [apc.lo] Error 1
          ERROR: `make' failed
  </code></pre>