Plone build on Heroku failed

gistfile1.txt

Created App
Configured Environment
Build App
There was an issue building your app. This can mean your app.json's project is not a valid Heroku application. Please ensure your app is deployable to Heroku and try again.

-----> Fetching custom git buildpack... done
-----> Plone app detected
-----> Use build cache
       Cache empty, let's fix that
       Prime with Unified Installer cache
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0

  0     0    0     0    0     0      0      0 --:--:--  0:00:01 --:--:--     0
  0 39.9M    0  137k    0     0  69401      0  0:10:03  0:00:02  0:10:01  143k
  0 39.9M    0  379k    0     0   124k      0  0:05:28  0:00:03  0:05:25  191k
  1 39.9M    1  645k    0     0   158k      0  0:04:17  0:00:04  0:04:13  215k
  2 39.9M    2  895k    0     0   178k      0  0:03:49  0:00:05  0:03:44  226k
  2 39.9M    2 1184k    0     0   196k      0  0:03:28  0:00:06  0:03:22  238k
  3 39.9M    3 1551k    0     0   221k      0  0:03:04  0:00:07  0:02:57  283k
  5 39.9M    5 2113k    0     0   263k      0  0:02:34  0:00:08  0:02:26  349k
  6 39.9M    6 2855k    0     0   317k      0  0:02:08  0:00:09  0:01:59  448k
 10 39.9M   10 4191k    0     0   418k      0  0:01:37  0:00:10  0:01:27  659k
 15 39.9M   15 6160k    0     0   559k      0  0:01:12  0:00:11  0:01:01 1002k
 22 39.9M   22 9137k    0     0   761k      0  0:00:53  0:00:12  0:00:41 1520k
 33 39.9M   33 13.3M    0     0  1049k      0  0:00:38  0:00:13  0:00:25 2310k
 45 39.9M   45 18.1M    0     0  1330k      0  0:00:30  0:00:14  0:00:16 3155k
 66 39.9M   66 26.6M    0     0  1819k      0  0:00:22  0:00:15  0:00:07 4632k
 93 39.9M   93 37.4M    0     0  2398k      0  0:00:17  0:00:16  0:00:01 6444k
100 39.9M  100 39.9M    0     0  2524k      0  0:00:16  0:00:16 --:--:-- 7580k
       Unpacking Installer
       Unpacking Installer cache
       Moving cache eggs to build directory
       Clean up Installer files
-----> Read BUILDOUT_CFG from env vars, or use default
       Using default: heroku.cfg
-----> Read BUILDOUT_VERBOSITY from env vars, or use default
       Use default buildout verbosity
-----> Read BOOTSTRAP_PY_URL from env vars, or use default
       Use default bootstrap.py: http://downloads.buildout.org/1/bootstrap.py
-----> Bootstrap buildout
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
100 10649  100 10649    0     0  26833      0 --:--:-- --:--:-- --:--:-- 26891
Downloading http://pypi.python.org/packages/2.7/s/setuptools/setuptools-0.6c11-py2.7.egg
Creating directory '/tmp/build_32660ba410ee27ce765d9db54ef1a014/plone-heroku-button-plone-70130a0/bin'.
Creating directory '/tmp/build_32660ba410ee27ce765d9db54ef1a014/plone-heroku-button-plone-70130a0/parts'.
Creating directory '/tmp/build_32660ba410ee27ce765d9db54ef1a014/plone-heroku-button-plone-70130a0/develop-eggs'.
Generated script '/tmp/build_32660ba410ee27ce765d9db54ef1a014/plone-heroku-button-plone-70130a0/bin/buildout'.
-----> Run bin/buildout -c heroku.cfg 
Getting distribution for 'ZODB3==3.10.5'.
In file included from src/BTrees/BTreeModuleTemplate.c:394:0,
                 from src/BTrees/_IIBTree.c:34:
src/BTrees/BucketTemplate.c: In function ‘bucket_traverse’:
src/BTrees/BucketTemplate.c:1627:12: warning: variable ‘len’ set but not used [-Wunused-but-set-variable]
     int i, len;
            ^
In file included from src/BTrees/BTreeModuleTemplate.c:394:0,
                 from src/BTrees/_IFBTree.c:34:
src/BTrees/BucketTemplate.c: In function ‘bucket_traverse’:
src/BTrees/BucketTemplate.c:1627:12: warning: variable ‘len’ set but not used [-Wunused-but-set-variable]
     int i, len;
            ^
In file included from src/BTrees/BTreeModuleTemplate.c:394:0,
                 from src/BTrees/_fsBTree.c:83:
src/BTrees/BucketTemplate.c: In function ‘bucket_traverse’:
src/BTrees/BucketTemplate.c:1627:12: warning: variable ‘len’ set but not used [-Wunused-but-set-variable]
     int i, len;
            ^
In file included from src/BTrees/BTreeModuleTemplate.c:394:0,
                 from src/BTrees/_LLBTree.c:36:
src/BTrees/BucketTemplate.c: In function ‘bucket_traverse’:
src/BTrees/BucketTemplate.c:1627:12: warning: variable ‘len’ set but not used [-Wunused-but-set-variable]
     int i, len;
            ^
In file included from src/BTrees/BTreeModuleTemplate.c:394:0,
                 from src/BTrees/_LFBTree.c:36:
src/BTrees/BucketTemplate.c: In function ‘bucket_traverse’:
src/BTrees/BucketTemplate.c:1627:12: warning: variable ‘len’ set but not used [-Wunused-but-set-variable]
     int i, len;
            ^
Got ZODB3 3.10.5.
Getting distribution for 'zope.interface==3.6.7'.
Got zope.interface 3.6.7.
Getting distribution for 'zope.security==3.7.4'.
Got zope.security 3.7.4.
Getting distribution for 'zope.proxy==3.6.1'.
Got zope.proxy 3.6.1.
Getting distribution for 'zope.i18nmessageid==3.5.3'.
Got zope.i18nmessageid 3.5.3.
Getting distribution for 'zope.container==3.11.2'.
Got zope.container 3.11.2.
Download error: [Errno 104] Connection reset by peer -- Some packages may not be found!
Couldn't find index page for 'initgroups' (maybe misspelled?)
Getting distribution for 'initgroups==2.13.0'.
While:
  Installing.
  Getting section instance.
  Initializing section instance.
  Installing recipe plone.recipe.zope2instance.
  Getting distribution for 'initgroups==2.13.0'.
Error: Couldn't find a distribution for 'initgroups==2.13.0'.

 !     Push rejected, failed to compile Plone app