Building sublibraries in parallel can lead to race conditions on the libseq
and lipord targets.

--- MUMPS_5.0.0/Makefile.orig	2015-06-15 10:08:54.523146562 -0500
+++ MUMPS_5.0.0/Makefile	2015-06-15 10:19:44.074367512 -0500
@@ -11,6 +11,7 @@
 	sexamples dexamples cexamples zexamples \
 	mumps_lib requiredobj libseqneeded clean
 
+.NOTPARALLEL:
 alllib:		c z s d
 all:		cexamples zexamples sexamples dexamples
 
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<tr><td><span title='2019-05-09 12:11:36 +0200'>2019-05-09</span></td><td><a href='/guix/commit/gnu/tests/ssh.scm?id=e6b1a2248ff164e14d1b2f495224faf8a8326142'>services: Log-in services now require "pam_loginuid".</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes &lt;https://bugs.gnu.org/35553&gt;.
Reported by Bruno Haible &lt;bruno@clisp.org&gt;.

* gnu/services/base.scm (login-pam-service): Pass #:login-uid? #t to
'unix-pam-service'.
* gnu/services/ssh.scm (lsh-pam-services, openssh-pam-services):
Likewise.
* gnu/services/xorg.scm (slim-pam-service): Likewise.
(gdm-pam-service): Likewise for "gdm-autologin" and "gdm-password".
* gnu/tests/base.scm (run-basic-test)["getlogin on tty1"]: New test.
* gnu/tests/ssh.scm (run-ssh-test): Add #:test-getlogin? parameter.
["getlogin"]: New test.
(%test-dropbear): Pass #:test-getlogin? #f.
</span></span></td><td>Ludovic Courtès</td></tr>