--- CMakeLists.txt.orign	2017-10-21 17:29:37.527236238 +0300
+++ CMakeLists.txt	2017-10-27 21:26:25.087770591 +0300
@@ -112,7 +112,7 @@
 set(ZM_WEB_USER "" CACHE STRING 
     "The user apache or the local web server runs on. Leave empty for automatic detection. 
      If that fails, you can use this variable to force")
-set(ZM_WEB_GROUP "" CACHE STRING 
+set(ZM_WEB_GROUP "_webserver" CACHE STRING 
     "The group apache or the local web server runs on, 
     Leave empty to be the same as the web user")
 # Advanced