Using ASCII runtime support

I've installed ASCII runtime support and can now successfully compile C
programs, but C++ programs fail. I'm using this CL:

CRTCPPMOD  MODULE(G1UNCMOD/CIOAPI) +
             SRCSTMF('/UNC/server/modules/cio/lib/cioapi+
             .cc') OPTION(*INCDIRFIRST *STDINC +
             *LONGLONG) SYSIFCOPT(*IFSIO) +
             LOCALETYPE(*LOCALE) TGTRLS(V5R2M0) +
             INCDIR('/qibm/proddata/qadrt/include')

...which is almost exactly the same as what I'm using for C, but C++ fails
with all sorts of errors like:

"/QIBM/include/std/xlocale", line 598.33: CZP0816(10) Too many arguments
  are specified for the macro "tolower". The extra arguments are ignored.
"/qibm/proddata/qadrt/include/ctype.h", line 464.9: CZP0425(0) "tolower"
  is defined on line 464 of "/UNC/server/modules/cio/lib/cioapi.cc".
"/qibm/proddata/qadrt/include/stdio.h", line 78.16: CZP0836(30) The
  #include file <QSYSINC/h/stdio> is not found.

This is v5r2m0, c3161. Any ideas?

Regards,
Zak Metz
.