Currently, it is possible to compile an agent under Cygwin. It even works when run with "-p"!

Unfortunately, there are two problems with it.

The first problem is that it terminates soon after start. It creates a PID file and a log file, and then disappears.

The second problem is that the platform it compiles for is "unknown" (i.e., the Windows-specific items are not available).

Apparently, since there are checks for Windows header files in configure.in, sometime in the ancient times Zabbix supported or tried to support Cygwin. That support should be brought back.