Tryton build fail and stdarg.h

[Tito Mari Francis Escaño]

Hello everyone,
I was trying to build Tryton on 6.2 and it fails complaining that stdarg.h is 
not found, this is related to the libxml2. Can somebody please point me to the 
right direction through this?
Further, what other option can I try as free and pen source ERP for OpenBSD 6.2?
Looking forward for your advise.
Thanks.