chebfun gives Illegal instruction: 4

[idontgetoutmuch]

I am trying to use chebfun (http://www.chebfun.org). I have

GNU Octave, version 5.1.0
Copyright (C) 2019 John W. Eaton and others.
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Octave was configured for "x86_64-apple-darwin17.7.0".

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octave:1> x = chebfun('x');
Illegal instruction: 4

Here's a bit more information:

Process:               octave-gui [85121]
Path:                 
/usr/local/Cellar/octave/5.1.0_4/libexec/octave/5.1.0/exec/x86_64-apple-darwin17.7.0/octave-gui
Identifier:            octave-gui
Version:               0
Code Type:             X86-64 (Native)
Parent Process:        bash [528]
Responsible:           octave-gui [85121]
User ID:               501

Date/Time:             2019-05-18 09:59:18.450 +0100
OS Version:            Mac OS X 10.13.2 (17C88)
Report Version:        12
Bridge OS Version:     3.0 (14Y661)
Anonymous UUID:        AF192181-CF73-67FF-365C-5F82B37F98B9

Sleep/Wake UUID:       EC474B27-7272-4B77-99EE-428BBBEC2525

Time Awake Since Boot: 320000 seconds
Time Since Wake:       1900 seconds

System Integrity Protection: enabled

Crashed Thread:        0  Dispatch queue: com.apple.main-thread

Exception Type:        EXC_CRASH (SIGILL)
Exception Codes:       0x0000000000000000, 0x0000000000000000
Exception Note:        EXC_CORPSE_NOTIFY

Termination Signal:    Illegal instruction: 4
Termination Reason:    Namespace SIGNAL, Code 0x4
Terminating Process:   octave-gui [85121]





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