[odb-users] odb build error: g++ does not support plugins

[G G]

I try to build odb by mingw 32bit  ( Windows 10 64bit ):
D:\build2\odb-build\odb-mingw>bpkg build odb at https://pkg.cppget.org/1/betaadded pkg:cppget.org/betafetching pkg:cppget.org/betawarning: authenticity of the certificate for repository pkg:cppget.org/beta cannot be establishedcertificate is for cppget.org, "Code Synthesis" <admin at cppget.org>certificate SHA256 fingerprint:86:BA:D4:DE:2C:87:1A:EE:38:C7:F1:64:7F:65:77:02:15:79:F3:C4:83:C0:AB:5A:EA:F4:F7:8C:1D:63:30:C6trust this certificate? [y/n] yfetching pkg:cppget.org/testing (complements pkg:cppget.org/beta)fetching pkg:cppget.org/stable (complements pkg:cppget.org/testing)  new libstudxml/1.1.0-b.7 (required by odb)  new libcutl/1.11.0-b.6 (required by odb)  new odb/2.5.0-b.15continue? [Y/n] ylibstudxml-1.1.0-b.7.tar.gz:################################################################################################################ 100,0%fetched libstudxml/1.1.0-b.7unpacked libstudxml/1.1.0-b.7configured libstudxml/1.1.0-b.7libcutl-1.11.0-b.6.tar.gz:################################################################################################################ 100,0%fetched libcutl/1.11.0-b.6unpacked libcutl/1.11.0-b.6configured libcutl/1.11.0-b.6odb-2.5.0-b.15.tar.gz:################################################################################################################ 100,0%fetched odb/2.5.0-b.15unpacked odb/2.5.0-b.15odb-2.5.0-b.15\build\root.build:23:3: error: g++ does not support plugins
D:\build2\odb-build\odb-mingw>g++ --versiong++ (i686-posix-dwarf-rev0, Built by MinGW-W64 project) 7.3.0Copyright (C) 2017 Free Software Foundation, Inc.This is free software; see the source for copying conditions.  There is NOwarranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
What is it mean? What should be g++ version ?  
Thanx.