trying to compile proxy with these flags :

./configure --enable-proxy --with-sqlite3 --with-libxml2 --with-net-snmp --with-ssh2 --with-openipmi --with-libcurl

linux.c:48:35: error: ‘PROC_CPU_UTIL’ undeclared here (not in a function)
  {"proc.cpu.util", CF_HAVEPARAMS, PROC_CPU_UTIL,  "inetd"},
                                   ^

looks like it got broken by :
------------------------------------------------------------------------
r55222 | wiper | 2015-08-28 13:28:26 +0300 (Fri, 28 Aug 2015) | 2 lines

...G...... ZBXNEXT-494 added support for proc.cpu.util key on linux and solaris platforms