Error: pip install pycapnp

Question

I've been trying to install pycapnp via pip on my macbook pro. But I seem to be having issues trying to download it.

The following is the error:

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/yv/f6fy_dm51799h6htr1nd30480000gn/T/pip-build-doQpew/
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/yv/f6fy_dm51799h6htr1nd30480000gn/T/pip-build-doQpew/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/yv/f6fy_dm51799h6htr1nd30480000gn/T/
pip-hawqg0-record/install-record.txt --single-version-externally-managed --compile" 
failed with error code 1 in /private/var/folders/yv/f6fy_dm51799h6htr1nd30480000gn/
T/pip-build-doQpew/pycapnp/

Any help would greatly be appreciated. Thank you!

Answer 1

Try to installed it by declaring

➜ export MACOSX_DEPLOYMENT_TARGET=10.10

Or

➜ CFLAGS='-stdlib=libc++' pip install pycapnp

Or

➜ export CXXFLAGS="-stdlib=libc++"
➜ export CFLAGS="-stdlib=libc++"

You can see more details from this issue

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By the way, I installed it successfully in virtualenv on my Macbook.