The request for account "Yahoo! Calendar" failed.

The server responded with
"502"
to operation
CalDAVAccountRefreshQueueableOperation.


Yahoo! have acknowledged this is a problem on their side:

We are aware of a Calendar (Proxy error) and our engineering team is working to resolve this issue. We apologize for the inconvenience and hope to have it resolved soon.

(source: Syncing / Mobile Sync | Yahoo! Calendar Help)

update 2nd November 2011: I am no longer seeing this error message, and Yahoo! have removed the notice from their help page. Looks like the issue has been resolved!

update 3rd November 2011: Seems like I spoke too soon, the error is back!

Thanks, Steve.

Thankfully, it is becoming simpler to install PHP extensions than with previous versions of OS X.

Xcode

The Xcode package installs the necessary versions of tools like autoconf which is needed during the PHP extension compilation process. Make sure you have at least Xcode v4.1 installed; the install package (“Install Xcode”) is available in your “Applications” folder.

libmcrypt

libmcrypt is the library that provides the encryption functions. We need to install this before building the PHP extension.

• Open up Terminal.app
• Download libmcrypt from sourceforge
• Unpack the archive somewhere
• cd libmcrypt
• ./configure
• make
• sudo make install

PHP Extension

Once we have libmcrypt installed, we can build the PHP extension.

• Download PHP 5.3.6 source
• Unpack the archive and cd php-5.3.6/ext/mcrypt/
• phpize

You should see output similar to the following:

Configuring for:
PHP Api Version:         20090626
Zend Module Api No:      20090626
Zend Extension Api No:   220090626

• ./configure
• make
• sudo make install

On successful install, you will see the following message:

Installing shared extensions:     /usr/lib/php/extensions/no-debug-non-zts-20090626/

To enable the module, include the following line in your /etc/php.ini file:

extension = mcrypt.so

Finally, restart your Apache server:

sudo apachectl restart

And that’s it: you should now be able to utilise the functions, as detailed in the PHP mcrypt documentation. If you are needing a simple way of accessing these functions, check out my SimpleCrypt class.

A couple of points that I noticed post-install. Firstly, my existing /etc/php.ini file was moved to /etc/php.ini-5.2-previous. Restoring this was trivial:

sudo cp /etc/php.ini-5.2-previous /etc/php.ini


However, I noticed that extensions previously installed under /usr/lib/php/extensions/no-debug-non-zts-20090626/ had been removed. So, if you have extensions that you wish to still use with 5.3, they will need to be re-built.

I also noticed that Apple have included the Suhosin patch and extension. Suhosin is part of the Hardened-PHP project which aims to protect PHP applications against buffer-overflow and format string vulnerabilities. In theory, this functionality should be transparent to your application – no configuration or code changes are required.

memcached is a very useful memory object caching system, which can be used to increase the performance of your dynamic scripts by caching database calls.

This guide will explain how to install the memcached system, including the PHP extension, on Mac OS X 10.6.

Xcode

The Xcode package installs the necessary versions of tools like autoconf which is needed during the PHP extension compilation process. Make sure you have Xcode 3.2 installed; the install package is available on the Snow Leopard install DVD under the “Optional Installs” folder.

libevent

libevent is a pre-requisite for memcached.

• cd /tmp; curl -O http://www.monkey.org/~provos/libevent-1.4.12-stable.tar.gz
• tar zxvf libevent-1.4.12-stable.tar.gz
• cd libevent-1.4.12-stable
• ./configure; make
• sudo make install

memcached

memcached is the daemon responsible for actually storing and retrieving arbitrary objects for your applications.

• cd /tmp; curl -O http://memcached.googlecode.com/files/memcached-1.4.1.tar.gz
• tar zxvf memcached-1.4.1.tar.gz
• cd memcached-1.4.1
• ./configure; make
• sudo make install

libmemcached

libmemcached is the shared library that will allow clients, in this case PHP, access the memcached daemon.

• Download libmemcached, move to /tmp and unpack
• cd libmemcached-0.31
• ./configure; make
• sudo make install

php extension

Now we are ready to prepare the PHP extension to memcached, which is available from pecl.

• cd /tmp; pecl download memcached
• gzip -d < memcached-1.0.0.tgz | tar -xvf -
• cd memcached-1.0.0; phpize

You should see output similar to the following:

Configuring for:
PHP Api Version: 20090626
Zend Module Api No: 20090626
Zend Extension Api No: 220090626


• ./configure; make
• sudo make install

On a successful install, you will get the following message:

Installing shared extensions: /usr/lib/php/extensions/no-debug-non-zts-20090626/

Modify your php.ini configuration file and make sure you have the following line included:

extension = memcached.so

You can then restart your Apache server:

• sudo apachectl restart

to make the memcached functionality available in your scripts.

References

• Compiling shared PECL extensions with phpize
• PHP: Memcached - Manual

Warning: getdate() [function.getdate]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Europe/London' for 'BST/1.0/DST' instead in /Users/gscott/Sites/hello-world.php on line 9

The solution is to edit (or create, if it doesn’t exist) /private/etc/php.ini and make sure a setting exists for date.timezone. For example:

date.timezone = Europe/London

After making the change, restart Apache

sudo apachectl restart

• List of supported timezones.

Adding additional functionality to the standard Apple-supplied PHP on Mac OS X 10.5 is a little tricky if you are running a 64 bit processor such as the Intel Core 2 Duo. The reason is that any dynamic extensions that you add will need to be 64 bit, and many shared libraries by default will compile as 32 bit binaries. Trying to use a 32 bit extension with a 64 bit PHP results in the following unfriendly error message:

PHP Warning: PHP Startup: Unable to load dynamic library './mcrypt.so' - (null) in Unknown on line 0

mcrypt is a good example of a useful extension that can be added to PHP with a little bit of effort:

• Open up your Terminal.app
• To explicitly build for 64 bit architecture export CFLAGS="-arch x86_64"
• Download libmcrypt from sourceforge http://sourceforge.net/projects/mcrypt
• Unpack the archive
• cd libmcrypt
• ./configure --disable-shared
• make
• sudo make install
• download PHP 5.2.6 source from http://www.php.net/get/php-5.2.6.tar.bz2/from/a/mirror
• unpack the archive and go into the php-5.2.6/ext/mcrypt/ dir
• phpize
• ./configure
• make
• sudo make install
• verify the extension is 64 bit: file /usr/lib/php/extensions/no-debug-non-zts-20060613/mcrypt.so

/usr/lib/php/extensions/no-debug-non-zts-20060613/mcrypt.so: Mach-O 64-bit bundle x86_64

To actually use the extension, you can simply create a symbolic link to it. For example:

• cd ~/Sites
• ln -s /usr/lib/php/extensions/no-debug-non-zts-20060613/mcrypt.so

Example code: mcrypt.php

Drop the following code into your ~/Sites directory to verify everything is working:

    <?php

    if ( ! extension_loaded('mcrypt') ) {
        dl('mcrypt.so');
    }

    $key   = "this is a secret key";
    $input = "Let us meet at 9 o'clock at the secret place.";

    $td = mcrypt_module_open('tripledes', '', 'ecb', '');
    $iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
    mcrypt_generic_init($td, $key, $iv);
    $encrypted_data = mcrypt_generic($td, $input);
    mcrypt_generic_deinit($td);
    mcrypt_module_close($td);

    print_r($encrypted_data);

    ?>

The error message suggests looking at the README file, which actually doesn’t exist. Luckily, there’s a simple fix; to increase the shared memory to the required 32Mb, create or edit the /etc/sysctl.conf file and include the following lines:

kern.sysv.shmall=8192
kern.sysv.shmseg=64
kern.sysv.shmmni=256
kern.sysv.shmmin=1
kern.sysv.shmmax=33554432

Reboot your machine for the settings to take effect, and re-launch the PostgreSQL installer which should now work as normal.

It’s very simple to get the newer 1.5 version up and running by compiling from source:

• Download the source code from subversion: Documents & files: Source code
• Unpack the source code and enter the subversion-1.5.x directory
• ./configure --without-sasl
• make
• sudo make install

This will install Subversion 1.5 in your /usr/local path.

I added the --without-sasl option to prevent the following error from occurring when committing files:

svn: Commit failed (details follow):
svn: Cannot negotiate authentication mechanism