Abdul Hadi Khan Abdul Hadi Khan - 28 days ago 30
Python Question

GMPY2 Not installing, mpir.h not found

I am trying to install gmpy2 on my Anaconda Python 3.5 distribution using pip. I was able to install other modules such as primefac perfectly. When I try to install gmpy2 this is what I get:

(C:\Program Files\Anaconda3) C:\WINDOWS\system32>pip install gmpy2
Collecting gmpy2
Using cached gmpy2-2.0.8.zip
Building wheels for collected packages: gmpy2
Running setup.py bdist_wheel for gmpy2 ... error
Complete output from command "C:\Program Files\Anaconda3\python.exe" -u -c "import setuptools, tokenize;__file__='C:\\Users\\HADIKH~1\\AppData\\Local\\Temp\\pip-build-hd7b270n\\gmpy2\\setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" bdist_wheel -d C:\Users\HADIKH~1\AppData\Local\Temp\tmplefsjn80pip-wheel- --python-tag cp35:
running bdist_wheel
running build
running build_ext
building 'gmpy2' extension
creating build
creating build\temp.win-amd64-3.5
creating build\temp.win-amd64-3.5\Release
creating build\temp.win-amd64-3.5\Release\src
C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\BIN\x86_amd64\cl.exe /c /nologo /Ox /W3 /GL /DNDEBUG /MD -DMPIR -DWITHMPFR -DWITHMPC "-IC:\Program Files\Anaconda3\include" "-IC:\Program Files\Anaconda3\include" "-IC:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE" "-IC:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\ATLMFC\INCLUDE" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.10240.0\ucrt" "-IC:\Program Files (x86)\Windows Kits\NETFXSDK\4.6.1\include\um" "-IC:\Program Files (x86)\Windows Kits\8.1\include\\shared" "-IC:\Program Files (x86)\Windows Kits\8.1\include\\um" "-IC:\Program Files (x86)\Windows Kits\8.1\include\\winrt" /Tcsrc\gmpy2.c /Fobuild\temp.win-amd64-3.5\Release\src\gmpy2.obj
gmpy2.c
c:\users\hadi khan\appdata\local\temp\pip-build-hd7b270n\gmpy2\src\gmpy.h(104): fatal error C1083: Cannot open include file: 'mpir.h': No such file or directory
error: command 'C:\\Program Files (x86)\\Microsoft Visual Studio 14.0\\VC\\BIN\\x86_amd64\\cl.exe' failed with exit status 2

----------------------------------------
Failed building wheel for gmpy2


I have noticed that whenever I try installing gmpy2 on a computer I always get some sort of error and it is a different one every time. Can someone please tell me how to fix this.

Thanks.

Answer

I maintain gmpy2 and unfortunately I have not been able to build Windows binaries for Python 3.5 and later. gmpy2 relies on either the MPIR or GMP libraries, and the MPFR and MPC libraries. There are detailed instructions included in the source distribution but they are not trivial to build on Windows. It is probably impossible(*) to build MPIR, MPFR, and MPC via pip. I would use the pre-compiled binaries available from http://www.lfd.uci.edu/~gohlke/pythonlibs/

(*) I'm sure it is possible with enough effort but I haven't done it.