building stable/10 on -current

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Hi,
On current r273808, make buildworld in a stable/10 tree fails
with:

building shared library libc.so.7
/usr/bin/ld: _umtx_unlock.So: relocation R_X86_64_32 against
`SYS__umtx_unlock' can not be used when making a shared object;
recompile with -fPIC
_umtx_unlock.So: could not read symbols: Bad value

However, poudriere can build it just fine in its jail.  I am
curious why that is.  Can a -current host be made to build
stable/10, or is that impossible?

Thanks,
Russell
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