I'm installing Sage for the first time, on a Mac OS El Capitan. I 
downloaded from:
http://files.sagemath.org/osx/intel/index.html

the file sage-7.6-OSX_10.12.3-x86_64.app.dmg, and dragged Sage into 
Applications.

The first time I opened Sage, a window opened that asked if I wanted to 
update something. I didn't take careful note of what it asked. I consented, 
and then two terminals opened and for a minute or two a log of some sort 
scrolled past. 

Now when I open Sage, a terminal opens with the following output, including 
what appear to be error messages. Then nothing happens, even if I wait a 
long time.

Last login: Thu Mar 30 14:00:34 on ttys004
syst203m4138:~ alex.jordan$ 
'/Applications/SageMath-7.6.app/Contents/Resources/sage/sage' 
--notebook=sagenb
/Applications/SageMath-7.6.app/Contents/Resources/sage/src/bin/sage-env: 
line 431: 79668 Trace/BPT trap: 5       "$SAGE_LOCAL/bin/python" -c 'import 
pkg_resources; pkg_resources.get_distribution("matplotlib").version' 2> 
/dev/null
┌────────────────────────────────────────────────────────────────────┐
│ SageMath version 7.6, Release Date: 2017-03-25                     │
│ Type "notebook()" for the browser-based notebook interface.        │
│ Type "help()" for help.                                            │
└────────────────────────────────────────────────────────────────────┘
Please wait while the old SageNB Notebook server starts...
dyld: lazy symbol binding failed: Symbol not found: _getentropy
  Referenced from: 
/Applications/SageMath-7.6.app/Contents/Resources/sage/local/lib/libpython2.7.dylib
  Expected in: /usr/lib/libSystem.B.dylib

dyld: Symbol not found: _getentropy
  Referenced from: 
/Applications/SageMath-7.6.app/Contents/Resources/sage/local/lib/libpython2.7.dylib
  Expected in: /usr/lib/libSystem.B.dylib

Trace/BPT trap: 5
syst203m4138:~ alex.jordan$


Is this evidence something is wrong with my installation? What should I 
expect to see to actually start using Sage? I was expecting some kind of 
Sage input tool.

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