The file pyconfig.h could not open because the include file 'io.h' does not exist in the specified directory

Background:

  • I am completely new to python and Cpp, and I am currently attempting to install a python package called python-crfsuite that requires Visual Studio for compilation.

  • To do this, I have installed Anaconda3 and Python 3.6 within the VS2017 community installer because I believe it offers better functionality due to the compiler it provides: cl.exe.

  • I made sure to run the vcvarsall.bat script before proceeding with any commands, and all of them are executed as an administrator.

Process:

While trying to execute the command pip install python-crfsuite, I encountered the following error message:


C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.10.25017\bin\HostX86\x86\cl.exe /c /nologo /Ox /W3 /GL /DNDEBUG /MD -Icrfsuite/include/ -Icrfsuite/lib/cqdb/include -Iliblbfgs/include -Ipycrfsuite -Icrfsuite/win32 -Iinclude "-IC:\Program Files\Anaconda3\include" "-IC:\Program Files\Anaconda3\include" /EHsc /Tppycrfsuite/_pycrfsuite.cpp /Fobuild\temp.win-amd64-3.6\Release\pycrfsuite/_pycrfsuite.obj
    _pycrfsuite.cpp
    c:\program files\anaconda3\include\pyconfig.h(59): fatal error C1083: Cannot open include file: 'io.h': No such file or directory
    error: command 'C:\\Program Files (x86)\\Microsoft Visual Studio\\2017\\Community\\VC\\Tools\\MSVC\\14.10.25017\\bin\\HostX86\\x86\\cl.exe' failed with exit status 2

  • In my attempt to resolve this issue, I followed advice provided in a thread on StackOverflow listed here. I tried modifying the system environment paths by replacing specific directories but unfortunately, it did not solve the problem.

  • Subsequently, I downloaded the missing header file io.h and placed it in 

    C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.10.25017\include
    without success.

  • As a last resort, I opted to use the command 

    conda install -c conda-forge python-crfsuite
    , which thankfully resulted in a successful installation.

Question

  • Why does using conda install eliminate the issues related to io.h, whereas pip install encounters them?

  • What is the significance of having multiple instances of cl.exe located in various paths within Visual Studio, and how does it impact their functionality?

I pose these questions as despite installing Anaconda, I continue to face challenges when using pip install, and I am still unable to determine the root cause of these obstacles.

pythonc++anacondavisual-studio-2017

Answer №1

Encountered a similar error while installing a package, but managed to resolve it by adding more tools from Visual Studio (specifically using VS 2017 Community and Python 3.6.4). Installed the following tools shown in the installer screenshot here:

  1. Desktop development with C++: Included all default items plus:

    • Windows XP support for C++
    • Support for C++/CLI
    • VC++ 2015.3 v140 toolset

  2. Linux development with C++

Next, opened Windows PowerShell with Administrator privileges (Right click to open), navigated to the Visual Studio installation folder and located this path:

cd [Visual Studio Path]\VC\Auxiliary\Build

Executed the following file: 

.\vcvars32.bat

After that, used pip as usual; for example, I installed Mayavi like so:

pip install mayavi

Hopefully, this solution proves helpful to someone else.

Answer №2

When using Windows 10, I found that the 'io.h' file is included with any 'SDK for Windows 10' in the Visual Studio installer (I resolved my issue with SDK version 10.0.20348.0).

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