nobs crash on Python 2.7.9 / Solaris

nobs currently crashes with the traceback below on pcp-d-[34], our x86 Solaris systems. Same crash also happens with an external GASNet.
Marking as minor because Solaris is not a currently supported platform. However it would be nice to understand what makes this Python install different and whether the same could occur in a Python install for a platform that is supported.
The Solaris system is running Python 2.7.9, which is newer than the 2.7.5 on our Linux test systems where things are working.
{pcp-d-3 ~/UPC/upcxx} rm -Rf .nobs/ ; ./install test | cat
Downloading http://gasnet.lbl.gov/EX/GASNet-2017.6.0.tar.gz
Finished    http://gasnet.lbl.gov/EX/GASNet-2017.6.0.tar.gz
Configuring GASNet...
(in /shared/bonachea/UPC/upcxx/.nobs/art/1c62206bae65250eabf6396b35f03fe077089ade)
/shared/bonachea/UPC/upcxx/.nobs/art/9163d390d22a920d4cc658efd176c74efbf88fa6/GASNet-2017.6.0/configure --disable-psm --disable-mxm --disable-portals4 --disable-ofi

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Uncaught exception

Traceback (most recent call last):
  File "/shared/bonachea/UPC/upcxx/nobs/nobs/tool_main.py", line 87, in main
    printed.wait()
  File "/shared/bonachea/UPC/upcxx/nobs/nobs/async.py", line 447, in wait
    return me.wait_futurized().value()
  File "/shared/bonachea/UPC/upcxx/nobs/nobs/async.py", line 751, in fire
    arg = gen_throw(arg.exception, None, arg.traceback)
  File "/shared/bonachea/UPC/upcxx/nobsrule.py", line 596, in install
    libset = yield cxt.library(main_src)
  File "/shared/bonachea/UPC/upcxx/nobs/nobs/async.py", line 751, in fire
    arg = gen_throw(arg.exception, None, arg.traceback)
  File "/shared/bonachea/UPC/upcxx/nobs/nobs/memodb.py", line 458, in memo_execute
    yield result
  File "/shared/bonachea/UPC/upcxx/nobs/nobs/async.py", line 751, in fire
    arg = gen_throw(arg.exception, None, arg.traceback)
  File "/shared/bonachea/UPC/upcxx/nobsrule.py", line 542, in execute
    objs, libset = yield me.crawl()
  File "/shared/bonachea/UPC/upcxx/nobs/nobs/async.py", line 751, in fire
    arg = gen_throw(arg.exception, None, arg.traceback)
  File "/shared/bonachea/UPC/upcxx/nobsrule.py", line 492, in crawl
    yield fresh_src(main_src)
  File "/shared/bonachea/UPC/upcxx/nobs/nobs/async.py", line 601, in fire1
    proxied = lam(arg_result)
  File "/shared/bonachea/UPC/upcxx/nobs/nobs/memodb.py", line 540, in result
    return resultoid()
  File "/shared/bonachea/UPC/upcxx/nobs/nobs/async.py", line 751, in fire
    arg = gen_throw(arg.exception, None, arg.traceback)
  File "/shared/bonachea/UPC/upcxx/nobs/nobs/memodb.py", line 458, in memo_execute
    yield result
  File "/shared/bonachea/UPC/upcxx/nobs/nobs/async.py", line 751, in fire
    arg = gen_throw(arg.exception, None, arg.traceback)
  File "/shared/bonachea/UPC/upcxx/nobsrule.py", line 382, in execute
    comp_pp, src, ipt = yield me.get_comp_pp_and_src_and_ipt()
  File "/shared/bonachea/UPC/upcxx/nobs/nobs/async.py", line 601, in fire1
    proxied = lam(arg_result)
  File "/shared/bonachea/UPC/upcxx/nobs/nobs/memodb.py", line 540, in result
    return resultoid()
  File "/shared/bonachea/UPC/upcxx/nobs/nobs/async.py", line 751, in fire
    arg = gen_throw(arg.exception, None, arg.traceback)
  File "/shared/bonachea/UPC/upcxx/nobsrule.py", line 374, in get_comp_pp_and_src_and_ipt
    comp_pp = yield cxt.comp_lang_pp(src)
  File "/shared/bonachea/UPC/upcxx/nobs/nobs/async.py", line 751, in fire
    arg = gen_throw(arg.exception, None, arg.traceback)
  File "/shared/bonachea/UPC/upcxx/nobsrule.py", line 187, in comp_lang_pp
    libs = yield cxt.libraries(src)
  File "/shared/bonachea/UPC/upcxx/nobs/nobs/async.py", line 751, in fire
    arg = gen_throw(arg.exception, None, arg.traceback)
  File "/shared/bonachea/UPC/upcxx/nobsrule.py", line 293, in libraries
    maybe_upcxx_backend = yield cxt.upcxx_backend()
  File "/shared/bonachea/UPC/upcxx/nobs/nobs/async.py", line 751, in fire
    arg = gen_throw(arg.exception, None, arg.traceback)
  File "/shared/bonachea/UPC/upcxx/nobsrule.py", line 213, in upcxx_backend
    gasnet = yield cxt.gasnet()
  File "/shared/bonachea/UPC/upcxx/nobs/nobs/async.py", line 751, in fire
    arg = gen_throw(arg.exception, None, arg.traceback)
  File "/shared/bonachea/UPC/upcxx/nobs/nobs/memodb.py", line 398, in memo_execute
    yield failure
  File "/shared/bonachea/UPC/upcxx/nobs/nobs/async.py", line 751, in fire
    arg = gen_throw(arg.exception, None, arg.traceback)
  File "/shared/bonachea/UPC/upcxx/nobsrule.py", line 841, in execute
    = yield me.get_config()
  File "/shared/bonachea/UPC/upcxx/nobs/nobs/async.py", line 601, in fire1
    proxied = lam(arg_result)
  File "/shared/bonachea/UPC/upcxx/nobs/nobs/memodb.py", line 540, in result
    return resultoid()
  File "/shared/bonachea/UPC/upcxx/nobs/nobs/async.py", line 751, in fire
    arg = gen_throw(arg.exception, None, arg.traceback)
  File "/shared/bonachea/UPC/upcxx/nobs/nobs/memodb.py", line 458, in memo_execute
    yield result
  File "/shared/bonachea/UPC/upcxx/nobs/nobs/async.py", line 751, in fire
    arg = gen_throw(arg.exception, None, arg.traceback)
  File "/shared/bonachea/UPC/upcxx/nobsrule.py", line 818, in execute
    env = env1
  File "/shared/bonachea/UPC/upcxx/nobs/nobs/async.py", line 751, in fire
    arg = gen_throw(arg.exception, None, arg.traceback)
  File "/shared/bonachea/UPC/upcxx/nobs/nobs/subexec.py", line 124, in launch
    out, err = yield go()
  File "/shared/bonachea/UPC/upcxx/nobs/nobs/async.py", line 604, in fire1
    proxied = lam(*arg_result._val_seq, **arg_result._val_kws)
  File "/shared/bonachea/UPC/upcxx/nobs/nobs/subexec.py", line 62, in go
    pid, ptfd = os.forkpty()
AttributeError: 'module' object has no attribute 'forkpty'
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