pkg/53887: "make replace" in math/py-numpy 1.16.0 hangs

[gson%gson.org@localhost (Andreas Gustafsson)]

>Number:         53887
>Category:       pkg
>Synopsis:       "make replace" in math/py-numpy 1.16.0 hangs
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Jan 17 14:35:00 +0000 2019
>Originator:     Andreas Gustafsson
>Release:        NetBSD 8.0
>Organization:

>Environment:
System: NetBSD
Architecture: x86_64
Machine: amd64
>Description:

"make replace" in pkgsrc/math/py-numpy hangs on my NetBSD 8.0/amd64
system with a freshly updated pkgsrc  The last messages printed are:

  build_src
  building py_modules sources
  building library "npymath" sources
  get_default_fcompiler: matching types: '['gnu', 'gnu95', 'g95']'
  customize GnuFCompiler
  Found executable /usr/pkgsrc/math/py-numpy/work/.g95/bin/g95
  gnu: no Fortran 90 compiler found
  Found executable /usr/pkgsrc/math/py-numpy/work/.cwrapper/bin/g77

proctree shows:

   \-+= 18423 gson make replace 
      \-+- 02533 gson /bin/sh -c set -e;\t\t\t\t\t if test -n "" &&  /usr/pkg/sbin/pkg_info -K /var/db/pkg -qe py27-numpy-1.16.0; then  echo ===\\> "Skipping installation of already handled package"
        \-+- 28564 gson /usr/bin/make _MAKE OPSYS OS_VERSION LOWER_OPSYS _PKGSRCDIR PKGTOOLS_VERSION _CC _PATH_ORIG _PKGSRC_BARRIER ALLOW_VULNERABLE_PACKAGES replace 
          \-+- 04015 gson /bin/sh -c (cd /usr/pkgsrc/math/py-numpy/work/numpy-1.16.0/ && /usr/bin/env PKGSRC_PYTHON_NO_EGG=defined DESTDIR=/usr/pkgsrc/math/py-numpy/work/.destdir ATLAS=None USETOOLS
            \--- 14685 gson /usr/pkg/bin/python2.7 setup.py install -c -O1 --single-version-externally-managed --root=/usr/pkgsrc/math/py-numpy/work/.destdir 

"ps -glaxwp 14685" shows:

    UID   PID PPID  CPU PRI NI    VSZ   RSS WCHAN  STAT TTY      TIME COMMAND
    101 14685 4015 9983  83  0 123384 27476 ttyraw I+   pts/2 0:00.42 /usr/pkg/bin/python2.7 setup.py install -c -O1 --single-version-externally-managed --root=/usr/pkgsrc/math/py-numpy/work/.destdir 

>How-To-Repeat:

>Fix: