# Install error on MacOSx

**URL:** <https://discourse.numenta.org/t/install-error-on-macosx/3610>\
**Category:** NuPIC\
**Tags:** installation\
**Created:** [March 9, 2018, 8:07pm UTC](https://discourse.numenta.org/t/install-error-on-macosx/3610 "2018-03-09T20:07:31Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![caterpillars](https://avatars.discourse-cdn.com/v4/letter/c/a3d4f5/32.png) [@caterpillars](https://discourse.numenta.org/u/caterpillars)\
**Post date:** [March 9, 2018, 8:07pm UTC](https://discourse.numenta.org/t/install-error-on-macosx/3610/1 "2018-03-09T20:07:31Z")

</div>

Hi,

I am very new to nupic and want to try it out. I am trying to install nupic on my Mac using: pip install nupic. Below is my error message, can you please help to see why is this and how I can install it successfully?

Compiling capnp/lib/capnp.pyx because it changed.  
[1/1] Cythonizing capnp/lib/capnp.pyx  
running install  
running build  
running build\_py  
creating build/lib.macosx-10.7-x86\_64-2.7  
creating build/lib.macosx-10.7-x86\_64-2.7/capnp  
copying capnp/ **init**.py -\> build/lib.macosx-10.7-x86\_64-2.7/capnp  
copying capnp/\_gen.py -\> build/lib.macosx-10.7-x86\_64-2.7/capnp  
copying capnp/version.py -\> build/lib.macosx-10.7-x86\_64-2.7/capnp  
copying capnp/ **init**.pxd -\> build/lib.macosx-10.7-x86\_64-2.7/capnp  
copying capnp/c++.capnp -\> build/lib.macosx-10.7-x86\_64-2.7/capnp  
copying capnp/schema.capnp -\> build/lib.macosx-10.7-x86\_64-2.7/capnp  
creating build/lib.macosx-10.7-x86\_64-2.7/capnp/helpers  
copying capnp/helpers/ **init**.pxd -\> build/lib.macosx-10.7-x86\_64-2.7/capnp/helpers  
copying capnp/helpers/helpers.pxd -\> build/lib.macosx-10.7-x86\_64-2.7/capnp/helpers  
copying capnp/helpers/non\_circular.pxd -\> build/lib.macosx-10.7-x86\_64-2.7/capnp/helpers  
copying capnp/helpers/asyncHelper.h -\> build/lib.macosx-10.7-x86\_64-2.7/capnp/helpers  
copying capnp/helpers/capabilityHelper.h -\> build/lib.macosx-10.7-x86\_64-2.7/capnp/helpers  
copying capnp/helpers/checkCompiler.h -\> build/lib.macosx-10.7-x86\_64-2.7/capnp/helpers  
copying capnp/helpers/fixMaybe.h -\> build/lib.macosx-10.7-x86\_64-2.7/capnp/helpers  
copying capnp/helpers/rpcHelper.h -\> build/lib.macosx-10.7-x86\_64-2.7/capnp/helpers  
copying capnp/helpers/serialize.h -\> build/lib.macosx-10.7-x86\_64-2.7/capnp/helpers  
creating build/lib.macosx-10.7-x86\_64-2.7/capnp/includes  
copying capnp/includes/ **init**.pxd -\> build/lib.macosx-10.7-x86\_64-2.7/capnp/includes  
copying capnp/includes/capnp\_cpp.pxd -\> build/lib.macosx-10.7-x86\_64-2.7/capnp/includes  
copying capnp/includes/schema\_cpp.pxd -\> build/lib.macosx-10.7-x86\_64-2.7/capnp/includes  
copying capnp/includes/types.pxd -\> build/lib.macosx-10.7-x86\_64-2.7/capnp/includes  
creating build/lib.macosx-10.7-x86\_64-2.7/capnp/lib  
copying capnp/lib/ **init**.pxd -\> build/lib.macosx-10.7-x86\_64-2.7/capnp/lib  
copying capnp/lib/capnp.pxd -\> build/lib.macosx-10.7-x86\_64-2.7/capnp/lib  
copying capnp/lib/ **init**.py -\> build/lib.macosx-10.7-x86\_64-2.7/capnp/lib  
copying capnp/lib/pickle\_helper.py -\> build/lib.macosx-10.7-x86\_64-2.7/capnp/lib  
copying capnp/lib/capnp.pyx -\> build/lib.macosx-10.7-x86\_64-2.7/capnp/lib  
creating build/lib.macosx-10.7-x86\_64-2.7/capnp/templates  
copying capnp/templates/module.pyx -\> build/lib.macosx-10.7-x86\_64-2.7/capnp/templates  
copying capnp/templates/setup.py.tmpl -\> build/lib.macosx-10.7-x86\_64-2.7/capnp/templates  
running build\_ext  
creating var/folders/d1/5827czq16bsc\_232k6\_b39f5m4n08x/T/tmpbX0QMv  
gcc -fno-strict-aliasing -I/anaconda/include -arch x86\_64 -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -c /var/folders/d1/5827czq16bsc\_232k6\_b39f5m4n08x/T/tmpbX0QMv/vers.cpp -o var/folders/d1/5827czq16bsc\_232k6\_b39f5m4n08x/T/tmpbX0QMv/vers.o --std=c++11  
/var/folders/d1/5827czq16bsc\_232k6\_b39f5m4n08x/T/tmpbX0QMv/vers.cpp:4:10: fatal error: ‘capnp/common.h’ file not found  
#include “capnp/common.h”  
^  
1 error generated.  
_WARNING_ no libcapnp detected or rebuild forced. Will download and build it from source now. If you have C++ Cap’n Proto installed, it may be out of date or is not being detected. Downloading and building libcapnp may take a while.  
already have /private/var/folders/d1/5827czq16bsc\_232k6\_b39f5m4n08x/T/pip-build-IqcKrh/pycapnp/bundled/capnproto-c++  
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /private/var/folders/d1/5827czq16bsc\_232k6\_b39f5m4n08x/T/pip-build-IqcKrh/pycapnp/build/lib/libkj.a(units.o) has no symbols  
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: /private/var/folders/d1/5827czq16bsc\_232k6\_b39f5m4n08x/T/pip-build-IqcKrh/pycapnp/build/lib/libcapnp.a(list.o) has no symbols  
building ‘capnp.lib.capnp’ extension  
creating build/temp.macosx-10.7-x86\_64-2.7  
creating build/temp.macosx-10.7-x86\_64-2.7/capnp  
creating build/temp.macosx-10.7-x86\_64-2.7/capnp/lib  
gcc -fno-strict-aliasing -I/anaconda/include -arch x86\_64 -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -I. -I/anaconda/include/python2.7 -I/private/var/folders/d1/5827czq16bsc\_232k6\_b39f5m4n08x/T/pip-build-IqcKrh/pycapnp/build/include -c capnp/lib/capnp.cpp -o build/temp.macosx-10.7-x86\_64-2.7/capnp/lib/capnp.o --std=c++11  
In file included from capnp/lib/capnp.cpp:476:  
./capnp/helpers/checkCompiler.h:4:8: warning: “Your compiler supports C++11 but your C++ standard library does not. If your system has libc++ installed (as should be the case on e.g. Mac OSX), try adding -stdlib=libc++ to your CFLAGS (ignore the other warning that says to use CXXFLAGS).” [-W#warnings]  
#warning “Your compiler supports C++11 but your C++ standard library does not. If your system has libc++ installed (as should be the case on e.g. Mac OSX), try adding -stdlib=libc++ to your CFLAGS (ignore the other warning that says to use CXXFLAGS).”  
^  
In file included from capnp/lib/capnp.cpp:476:  
In file included from ./capnp/helpers/checkCompiler.h:9:  
In file included from /private/var/folders/d1/5827czq16bsc\_232k6\_b39f5m4n08x/T/pip-build-IqcKrh/pycapnp/build/include/capnp/dynamic.h:40:  
In file included from /private/var/folders/d1/5827czq16bsc\_232k6\_b39f5m4n08x/T/pip-build-IqcKrh/pycapnp/build/include/capnp/schema.h:33:  
In file included from /private/var/folders/d1/5827czq16bsc\_232k6\_b39f5m4n08x/T/pip-build-IqcKrh/pycapnp/build/include/capnp/schema.capnp.h:7:  
In file included from /private/var/folders/d1/5827czq16bsc\_232k6\_b39f5m4n08x/T/pip-build-IqcKrh/pycapnp/build/include/capnp/generated-header-support.h:31:  
In file included from /private/var/folders/d1/5827czq16bsc\_232k6\_b39f5m4n08x/T/pip-build-IqcKrh/pycapnp/build/include/capnp/layout.h:36:  
/private/var/folders/d1/5827czq16bsc\_232k6\_b39f5m4n08x/T/pip-build-IqcKrh/pycapnp/build/include/kj/common.h:54:8: warning: "Your compiler supports C++11 but your C++ standard library does not. If your " "system has libc++ installed (as should be the case on e.g. Mac OSX), try adding " “-stdlib=libc++ to your CXXFLAGS.” [-W#warnings]  
#warning "Your compiler supports C++11 but your C++ standard library does not. If your "  
^  
/private/var/folders/d1/5827czq16bsc\_232k6\_b39f5m4n08x/T/pip-build-IqcKrh/pycapnp/build/include/kj/common.h:78:10: fatal error: ‘initializer\_list’ file not found  
#include \<initializer\_list\>  
^  
2 warnings and 1 error generated.  
error: command ‘gcc’ failed with exit status 1

```
----------------------------------------

```

Command “/anaconda/bin/python -u -c “import setuptools, tokenize; **file** =’/private/var/folders/d1/5827czq16bsc\_232k6\_b39f5m4n08x/T/pip-build-IqcKrh/pycapnp/setup.py’;f=getattr(tokenize, ‘open’, open)( **file** );code=f.read().replace(’\r\n’, ‘\n’);f.close();exec(compile(code, **file** , ‘exec’))” install --record /var/folders/d1/5827czq16bsc\_232k6\_b39f5m4n08x/T/pip-8uW\_gG-record/install-record.txt --single-version-externally-managed --compile” failed with error code 1 in /private/var/folders/d1/5827czq16bsc\_232k6\_b39f5m4n08x/T/pip-build-IqcKrh/pycapnp/

Thanks a lot!

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<div class="post-metadata">

**Author:** ![rhyolight](https://yyz2.discourse-cdn.com/flex030/user_avatar/discourse.numenta.org/rhyolight/32/3922_2.png) [@rhyolight](https://discourse.numenta.org/u/rhyolight)\
**Post date:** [March 9, 2018, 11:29pm UTC](https://discourse.numenta.org/t/install-error-on-macosx/3610/2 "2018-03-09T23:29:16Z")

</div>

> [@caterpillars](#):
>
> Your compiler supports C++11 but your C++ standard library does not.

Please be sure you have installed the C++ 11 standard library.