install --single fails with external GASNET install

Using the new install --single in a0d6e07 with external GASNET install fails.
Note the script error on the first line, and the fact nobs attempts to invoke a non-existent configure script in the GASNet install.
{pcp-d-5 ~/UPC/upcxx} rm -Rf .nobs/ ; env GASNET=/home/pcp1/bonachea/UPC/inst-ex-debug DBGSYM=1 OPTLEV=0 ./install --single test6
./install: line 17: [: --single: integer expression expected
UPCXX revision: a0d6e07
System: Linux pcp-d-5 3.10.0-693.1.1.el7.x86_64 #1 SMP Tue Aug 15 08:36:44 CDT 2017 x86_64 x86_64 x86_64 GNU/Linux
LSB Version:    :core-4.1-amd64:core-4.1-noarch
Distributor ID: Scientific
Description:    Scientific Linux release 7.3 (Nitrogen)
Release:        7.3
Codename:       Nitrogen

Date: Fri Sep 22 14:44:58 PDT 2017
Current directory: /home/pcp1/bonachea/UPC/upcxx
Install directory:
Settings: GASNET='/home/pcp1/bonachea/UPC/inst-ex-debug' OPTLEV='0' DBGSYM='1'

/usr/local/pkg/gcc/7.2.0/bin/g++
g++ (GCC) 7.2.0
Copyright (C) 2017 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

/usr/local/pkg/gcc/7.2.0/bin/gcc
gcc (GCC) 7.2.0
Copyright (C) 2017 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.


Configuring GASNet...
(in /home/pcp1/bonachea/UPC/upcxx/.nobs/art/d284e6d5e76b0a1d331ad1a66739b933cbd9d35f)
/home/pcp1/bonachea/UPC/inst-ex-debug/configure --enable-debug --disable-psm --disable-mxm --disable-portals4 --disable-ofi --disable-dev-warnings

Building GASNet (conduit=smp, threading=seq)...
(in /home/pcp1/bonachea/UPC/upcxx/.nobs/art/d284e6d5e76b0a1d331ad1a66739b933cbd9d35f/smp-conduit)
make seq

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

Traceback (most recent call last):
  File "/home/pcp1/bonachea/UPC/upcxx/nobs/nobs/tool_main.py", line 87, in main
    printed.wait()
  File "/home/pcp1/bonachea/UPC/upcxx/nobs/nobs/async.py", line 447, in wait
    return me.wait_futurized().value()
  File "/home/pcp1/bonachea/UPC/upcxx/nobs/nobs/async.py", line 751, in fire
    arg = gen_throw(arg.exception, None, arg.traceback)
  File "/home/pcp1/bonachea/UPC/upcxx/nobsrule.py", line 659, in install
    libset = yield cxt.library(main_src)
  File "/home/pcp1/bonachea/UPC/upcxx/nobs/nobs/async.py", line 751, in fire
    arg = gen_throw(arg.exception, None, arg.traceback)
  File "/home/pcp1/bonachea/UPC/upcxx/nobs/nobs/memodb.py", line 437, in memo_execute
    yield result
  File "/home/pcp1/bonachea/UPC/upcxx/nobs/nobs/async.py", line 751, in fire
    arg = gen_throw(arg.exception, None, arg.traceback)
  File "/home/pcp1/bonachea/UPC/upcxx/nobsrule.py", line 607, in execute
    objs, libset = yield me.crawl()
  File "/home/pcp1/bonachea/UPC/upcxx/nobs/nobs/async.py", line 751, in fire
    arg = gen_throw(arg.exception, None, arg.traceback)
  File "/home/pcp1/bonachea/UPC/upcxx/nobsrule.py", line 548, in crawl
    yield fresh_src(main_src)
  File "/home/pcp1/bonachea/UPC/upcxx/nobs/nobs/async.py", line 601, in fire1
    proxied = lam(arg_result)
  File "/home/pcp1/bonachea/UPC/upcxx/nobs/nobs/memodb.py", line 519, in result
    return resultoid()
  File "/home/pcp1/bonachea/UPC/upcxx/nobs/nobs/async.py", line 751, in fire
    arg = gen_throw(arg.exception, None, arg.traceback)
  File "/home/pcp1/bonachea/UPC/upcxx/nobs/nobs/memodb.py", line 437, in memo_execute
    yield result
  File "/home/pcp1/bonachea/UPC/upcxx/nobs/nobs/async.py", line 751, in fire
    arg = gen_throw(arg.exception, None, arg.traceback)
  File "/home/pcp1/bonachea/UPC/upcxx/nobsrule.py", line 435, in execute
    comp_pp, src = yield me.get_stuff()
  File "/home/pcp1/bonachea/UPC/upcxx/nobs/nobs/async.py", line 601, in fire1
    proxied = lam(arg_result)
  File "/home/pcp1/bonachea/UPC/upcxx/nobs/nobs/memodb.py", line 519, in result
    return resultoid()
  File "/home/pcp1/bonachea/UPC/upcxx/nobs/nobs/async.py", line 751, in fire
    arg = gen_throw(arg.exception, None, arg.traceback)
  File "/home/pcp1/bonachea/UPC/upcxx/nobsrule.py", line 429, in get_stuff
    comp_pp = yield cxt.comp_lang_pp(src)
  File "/home/pcp1/bonachea/UPC/upcxx/nobs/nobs/async.py", line 751, in fire
    arg = gen_throw(arg.exception, None, arg.traceback)
  File "/home/pcp1/bonachea/UPC/upcxx/nobsrule.py", line 195, in comp_lang_pp
    libs = yield cxt.libraries(src)
  File "/home/pcp1/bonachea/UPC/upcxx/nobs/nobs/async.py", line 751, in fire
    arg = gen_throw(arg.exception, None, arg.traceback)
  File "/home/pcp1/bonachea/UPC/upcxx/nobsrule.py", line 306, in libraries
    maybe_upcxx_backend = yield cxt.upcxx_backend()
  File "/home/pcp1/bonachea/UPC/upcxx/nobs/nobs/async.py", line 751, in fire
    arg = gen_throw(arg.exception, None, arg.traceback)
  File "/home/pcp1/bonachea/UPC/upcxx/nobsrule.py", line 221, in upcxx_backend
    gasnet = yield cxt.gasnet()
  File "/home/pcp1/bonachea/UPC/upcxx/nobs/nobs/async.py", line 751, in fire
    arg = gen_throw(arg.exception, None, arg.traceback)
  File "/home/pcp1/bonachea/UPC/upcxx/nobs/nobs/memodb.py", line 377, in memo_execute
    yield failure
  File "/home/pcp1/bonachea/UPC/upcxx/nobs/nobs/async.py", line 749, in fire
    arg = gen_send(arg.value())
  File "/home/pcp1/bonachea/UPC/upcxx/nobsrule.py", line 995, in execute
    GASNET_LD = shplit(makefile_extract(makefile, 'GASNET_LD'))
  File "/home/pcp1/bonachea/UPC/upcxx/nobsrule.py", line 1105, in makefile_extract
    raise Exception('Makefile %s not found.'%makefile)
Exception: Makefile /home/pcp1/bonachea/UPC/upcxx/.nobs/art/d284e6d5e76b0a1d331ad1a66739b933cbd9d35f/smp-conduit/smp-seq.mak not found.
(END)UPC++ Installation failed. Please report the entire log above to: upcxx@googlegroups.com
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