add php5-gd to depends. We use it for image scaling

distros/ubuntu1410/control

@@ -86,7 +86,7 @@ Section: web
 Architecture: any
 Depends: zoneminder-core (= ${binary:Version}), ${shlibs:Depends},
  ${misc:Depends}, debconf, apache2, libapache2-mod-php5 | libapache2-mod-fcgid,
- php5, php5-mysql | php5-mysqlnd
+ php5, php5-mysql | php5-mysqlnd, php5-gd
 Description: Essential files for ZoneMinder's web user interface
  ZoneMinder is a video camera security and surveillance solution.
  .

distros/ubuntu1504_cmake/control

@@ -51,7 +51,7 @@ Depends: ${shlibs:Depends}, ${misc:Depends}, ${perl:Depends}
           ,libwww-perl
         ,mysql-client | virtual-mysql-client
         ,perl-modules
-        ,php5-mysql
+        ,php5-mysql, php5-gd
         ,policykit-1
         ,rsyslog | system-log-daemon
         ,zip