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='2019-03-25 23:37:06 +0100'>2019-03-25</span></td><td><a href='/guix/commit/gnu/system/accounts.scm?id=cf848cc0a17a3a58d600116896f6e7abfb0440d4'>accounts: Add default value for the 'home-directory' field of &lt;user-account&gt;.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
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