include process v2 header file cause compile failed in aix platfrom

[maplness]

i include boost/process/v2/process.hpp ,cause a compiler error , compiler complain about #error "Platform not supported",
i checked about code in boost/process/v2/pid.hpp and found about there is no _AIX macro defined, and i searched information on internet , there is few information for that. And official document also not talking about aix.
i just curious that is it really not supported for aix?