When I tried to use pear under Mac OS X Mavericks DP6, I got a very unhelpful error message: $ pecl Could not open input file: /usr/lib/php/peclcmd.php It seems that pear & pecl are not preinstalled! No problem, at least Mavericks provides an install package. sudo php -d detect_unicode=0 /usr/lib/php/install-pear-nozlib.phar Then the nightmare began: $ sudo pecl install uploadprogress downloading