[...]

checking for posix_fadvise... yes
checking for posix_fallocate... yes
checking for malloc.h... yes
checking for strndup... yes
checking for posix_memalign... yes
checking for memalign... yes
checking for malloc_usable_size... yes
checking whether malloc_usable_size definition can use const argument... no
checking for valloc in malloc.h... yes
checking for valloc in unistd.h... no
checking for localeconv... (cached) yes
updating cache ./config.cache
creating ./config.data
Creating config.status
Traceback (most recent call last):
  File "../../../configure.py", line 127, in <module>
    sys.exit(main(sys.argv))
  File "../../../configure.py", line 34, in main
    return config_status(config)
  File "../../../configure.py", line 122, in config_status
    return config_status(args=[], **encode(sanitized_config, encoding))
  File "/tmp/B.ed8van/BUILD/firefox-60.7.0/python/mozbuild/mozbuild/config_status.py", line 133, in config_status
    reader = BuildReader(env)
  File "/tmp/B.ed8van/BUILD/firefox-60.7.0/python/mozbuild/mozbuild/frontend/reader.py", line 868, in __init__
    self._gyp_worker_pool = ProcessPoolExecutor(max_workers=max_workers)
  File "/tmp/B.ed8van/BUILD/firefox-60.7.0/third_party/python/futures/concurrent/futures/process.py", line 285, in __init__
    EXTRA_QUEUED_CALLS)
  File "/usr/lib64/python2.7/multiprocessing/__init__.py", line 218, in Queue
    return Queue(maxsize)
  File "/usr/lib64/python2.7/multiprocessing/queues.py", line 63, in __init__
    self._rlock = Lock()
  File "/usr/lib64/python2.7/multiprocessing/synchronize.py", line 147, in __init__
    SemLock.__init__(self, SEMAPHORE, 1, 1)
  File "/usr/lib64/python2.7/multiprocessing/synchronize.py", line 75, in __init__
    sl = self._semlock = _multiprocessing.SemLock(kind, value, maxvalue)
OSError: [Errno 38] Function not implemented
error: Bad exit status from /tmp/B.ed8van/BUILD/tmp/rpm-tmp.149 (%build)
RPM build errors:
    Bad exit status from /tmp/B.ed8van/BUILD/tmp/rpm-tmp.149 (%build)
ended at: Sun Aug 25 00:47:20 2019, done in 0:01:39.209680
error: No files produced.
+ chmod -R u+rwX /tmp/B.ed8van/BUILD
+ rm -rf /tmp/B.ed8van/tmp /tmp/B.ed8van/BUILD
+ rm -rf /tmp/B.ed8van
Begin-TLD-Builder-Info
Build-Time: user:22.65s sys:11.32s real:108.82s (faults io:85 non-io:801349)
End-TLD-Builder-Info