Apple's newest release of OS X, El Capitan, includes a security feature that hobbles some of the capabilities of root: SIP. This includes preventing root from changing /usr/bin. This also prevents cpan from installing a new version of CPAN as seen here: 
{s10:~} whoami
root
{s10:~} cpan CPAN
CPAN: Storable loaded ok (v2.41)
Reading '/var/root/.cpan/Metadata'
  Database was generated on Thu, 08 Oct 2015 10:41:02 GMT
Running install for module 'CPAN'
Running make for A/AN/ANDK/CPAN-2.10.tar.gz
CPAN: Digest::SHA loaded ok (v5.84_01)
CPAN: Compress::Zlib loaded ok (v2.069)
Checksum for /var/root/.cpan/sources/authors/id/A/AN/ANDK/CPAN-2.10.ta
+r.gz ok
CPAN: File::Temp loaded ok (v0.23)
CPAN: Parse::CPAN::Meta loaded ok (v1.4417)
CPAN: CPAN::Meta loaded ok (v2.150005)
CPAN: Module::CoreList loaded ok (v3.03)

  CPAN.pm: Building A/AN/ANDK/CPAN-2.10.tar.gz


Checking if your kit is complete...
Looks good
Generating a Unix-style Makefile
Writing Makefile for CPAN
Writing MYMETA.yml and MYMETA.json

<snip>

All tests successful.
Files=30, Tests=701, 28 wallclock secs ( 0.39 usr  0.06 sys + 18.83 cu
+sr  3.16 csys = 22.44 CPU)
Result: PASS
  ANDK/CPAN-2.10.tar.gz
  /usr/bin/make test -- OK
Running make install
Manifying 2 pod documents
Manifying 16 pod documents
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+!!
ERROR: Can't create '/usr/bin'
Do not have write permissions on '/usr/bin'
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+!!
 at -e line 1.
make: *** [pure_perl_install] Error 1
  ANDK/CPAN-2.10.tar.gz
  /usr/bin/make install  -- NOT OK
{s10:~}

[download]

I'm looking for suggestions on how to best work around this. It is possible to disable SIP but I'd prefer not to.

TIA

In reply to CPAN on El Capitan by rhumbliner

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