title: Failed to write error when installing intl extension on Os x El Capitan
body: <p>I'm trying to install intl extension on Os x El Capitan. Every time i run <code>sudo pecl install intl</code>, i'm getting following error on the last step. I don't know why the copy operation failed. Is it a bug or am i missing something?</p>
  
  <p>Any help is really appreciated!</p>
  
  <p><strong>Note</strong>: I have installed <code>autoconf</code> and <code>icu4c</code> correctly.</p>
  
  <pre>
  Build complete.
  Don't forget to run 'make test'.
  
  running: make INSTALL_ROOT="/private/tmp/pear/install/pear-build-rootM6zI6U/install-intl-3.0.0" install
  Installing shared extensions:     /private/tmp/pear/install/pear-build-rootM6zI6U/install-intl-3.0.0/usr/lib/php/extensions/no-debug-non-zts-20121212/
  running: find "/private/tmp/pear/install/pear-build-rootM6zI6U/install-intl-3.0.0" | xargs ls -dils
  20728993   0 drwxr-xr-x  3 root  wheel     102 Oct 19 19:33 /private/tmp/pear/install/pear-build-rootM6zI6U/install-intl-3.0.0
  20729918   0 drwxr-xr-x  3 root  wheel     102 Oct 19 19:33 /private/tmp/pear/install/pear-build-rootM6zI6U/install-intl-3.0.0/usr
  20729919   0 drwxr-xr-x  3 root  wheel     102 Oct 19 19:33 /private/tmp/pear/install/pear-build-rootM6zI6U/install-intl-3.0.0/usr/lib
  20729920   0 drwxr-xr-x  3 root  wheel     102 Oct 19 19:33 /private/tmp/pear/install/pear-build-rootM6zI6U/install-intl-3.0.0/usr/lib/php
  20729921   0 drwxr-xr-x  3 root  wheel     102 Oct 19 19:33 /private/tmp/pear/install/pear-build-rootM6zI6U/install-intl-3.0.0/usr/lib/php/extensions
  20729922   0 drwxr-xr-x  3 root  wheel     102 Oct 19 19:33 /private/tmp/pear/install/pear-build-rootM6zI6U/install-intl-3.0.0/usr/lib/php/extensions/no-debug-non-zts-20121212
  20729923 864 -rwxr-xr-x  1 root  wheel  440756 Oct 19 19:33 /private/tmp/pear/install/pear-build-rootM6zI6U/install-intl-3.0.0/usr/lib/php/extensions/no-debug-non-zts-20121212/intl.so
  
  Build process completed successfully
  Installing '/usr/lib/php/extensions/no-debug-non-zts-20121212/intl.so'
  ERROR: failed to write /usr/lib/php/extensions/no-debug-non-zts-20121212/intl.so (copy(/usr/lib/php/extensions/no-debug-non-zts-20121212/intl.so): failed to open stream: Operation not permitted)
  </pre>