libstdc++-v3 on RedHat 7 - how ?

[Dr. David Gilbert]

Hi,
  Well I'm nearly there - I've built the -60 SRPM of gcc from the rawhide
directory.  I've set the flag for v3 and removed the newabi patches; the
one problem I'm hitting now is:

/usr/include/g++-v3/bits/std_fstream.h:79: variable or field `_M_lock'
declared void

Indeed /usr/include/libio.h does appear to set _IO_lock_t to void.

Ideas?

Dave
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