add check for zlib

diff --git a/lib/util.php b/lib/util.php
index 1dcf7c2cbfa355ce7cf7cf177f523601ced2d82e..b742e27b55d9ffab06f6424d5bdd3c1d3fe8c0ba 100755 (executable)
--- a/lib/util.php
+++ b/lib/util.php
@@ -276,6 +276,9 @@ class OC_Util {
                if(!function_exists('imagepng')){
                        $errors[]=array('error'=>'PHP module GD is not installed.<br/>','hint'=>'Please ask your server administrator to install the module.');
                }
+               if(!function_exists('gzencode')){
+                       $errors[]=array('error'=>'PHP module zlib is not installed.<br/>','hint'=>'Please ask your server administrator to install the module.');
+               }
                if(floatval(phpversion())<5.3){
                        $errors[]=array('error'=>'PHP 5.3 is required.<br/>','hint'=>'Please ask your server administrator to update PHP to version 5.3 or higher. PHP 5.2 is no longer supported by ownCloud and the PHP community.');
                }