Hello Andrew,

I run El Capitan 10.11.6:

menu@macbookprojm:~/Documents/LaTeX/PartitionsLilypond > uname -a
Darwin macbookprojm 15.6.0 Darwin Kernel Version 15.6.0: Mon Aug 29 20:21:34 
PDT 2016; root:xnu-3248.60.11~1/RELEASE_X86_64 x86_64

and I get:

menu@macbookprojm:~ > sudo dtruss lilypond --version

GNU LilyPond 2.19.44

Copyright (c) 1996--2015 by
  Han-Wen Nienhuys <han...@xs4all.nl>
  Jan Nieuwenhuizen <jann...@gnu.org>
  and others.

This program is free software.  It is covered by the GNU General Public
License and you are welcome to change it and/or distribute copies of it
under certain conditions.  Invoke as `lilypond --warranty' for more
information.

SYSCALL(args)            = return
thread_selfid(0x0, 0x0, 0x0)             = 124530 0
csops(0x0, 0x0, 0xBFFFE7E0)              = 0 0
issetugid(0x0, 0x0, 0xBFFFE7E0)          = 0 0
shared_region_check_np(0xBFFFC740, 0x0, 0xBFFFE7E0)              = 0 0
stat64("/usr/lib/dtrace/libdtrace_dyld.dylib\0", 0xBFFFDD78, 0xBFFFE7E0)        
         = 0 0
open("/usr/lib/dtrace/libdtrace_dyld.dylib\0", 0x0, 0x0)                 = 3 0
pread(0x3, "\312\376\272\276\0", 0x1000, 0x0)            = 4096 0
pread(0x3, "\316\372\355\376\a\0", 0x1000, 0x1000)               = 4096 0
fcntl(0x3, 0x61, 0xFFFFFFFFBFFFC250)             = 0 0
mmap(0x0, 0x564, 0x5, 0x1, 0x3, 0x1000)          = 0x7A8000 0
munmap(0x7A8000, 0x564)          = 0 0
mmap(0x7A8000, 0x2000, 0x1, 0x12, 0x3, 0x1000)           = 0x7A8000 0
mmap(0x7AA000, 0x1000, 0x3, 0x12, 0x3, 0x3000)           = 0x7AA000 0
mmap(0x7AB000, 0x2F10, 0x1, 0x12, 0x3, 0x4000)           = 0x7AB000 0
close(0x3)               = 0 0
stat64("/usr/lib/dtrace/libdtrace_dyld.dylib\0", 0xBFFFE290, 0x1)               
 = 0 0
…

Your configuration seems to have some other problem as far as I can guess.

JM


> Le 4 sept. 2016 à 15:56, Andrew Bernard <andrew.bern...@gmail.com> a écrit :
> 
> Hi Jacques,
> 
> Sorry to be repetitive. What OS are you running?
> 
> On 10.11.6 El Capitan, this is the scenario:
> 
> sudo dtruss lilypond --version
> Password:
> 
> dtrace: failed to execute lilypond: dtrace cannot control executables signed 
> with restricted entitlements
> 
> It all about this hard to understand ‘rootless’ system that Apple have 
> introduced. It seems you have to adjust things with csrutil, but I cannot get 
> that to work.
> 
> Andrew
> 
> 
> 
> 
> On 4 September 2016 at 11:39:19 PM, Jacques Menu Muzhic 
> (imj-muz...@bluewin.ch <mailto:imj-muz...@bluewin.ch>) wrote:
> 
>> Hello Andrew,
>> 
>> Here is what I got spying a running Frescobaldi instance when I closed an 
>> open file:
>> 
>> menu@macbookprojm:~/Documents/LaTeX/PartitionsLilypond > sudo dtruss -p 1273
>> 

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