Unable to pip install btef C extension in MSYS2

output.txt

Collecting btef
  Using cached btef-0.1.tar.gz
Building wheels for collected packages: btef
  Running setup.py bdist_wheel for btef: started
  Running setup.py bdist_wheel for btef: finished with status 'error'
  Complete output from command /usr/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-le6ys8sd/btef/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" bdist_wheel -d /tmp/tmpa4fkl9c3pip-wheel- --python-tag cp36:
  running bdist_wheel
  running build
  running build_ext
  building 'btef' extension
  creating build
  creating build/temp.mingw64_nt-6.1-2.9.0(0.318
  creating build/temp.mingw64_nt-6.1-2.9.0(0.318/5
  creating build/temp.mingw64_nt-6.1-2.9.0(0.318/5/3)-x86_64-3.6
  creating build/temp.mingw64_nt-6.1-2.9.0(0.318/5/3)-x86_64-3.6/src
  x86_64-pc-msys-gcc -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -march=x86-64 -mtune=generic -O2 -pipe -I/usr/include/python3.6m -c src/btefmodule.c -o build/temp.mingw64_nt-6.1-2.9.0(0.318/5/3)-x86_64-3.6/src/btefmodule.o
  src/btefmodule.c: In function ‘set_encoding’:
  src/btefmodule.c:11:10: warning: implicit declaration of function ‘PyFile_Check’ [-Wimplicit-function-declaration]
       if (!PyFile_Check(f)) {
            ^~~~~~~~~~~~
  src/btefmodule.c:16:5: warning: implicit declaration of function ‘PyFile_SetEncoding’ [-Wimplicit-function-declaration]
       PyFile_SetEncoding(f, encoding);
       ^~~~~~~~~~~~~~~~~~
  src/btefmodule.c: In function ‘initbtef’:
  src/btefmodule.c:37:12: warning: implicit declaration of function ‘Py_InitModule3’ [-Wimplicit-function-declaration]
       (void) Py_InitModule3("btef", BtefMethods, btef_module_doc);
              ^~~~~~~~~~~~~~
  src/btefmodule.c:38:1: warning: control reaches end of non-void function [-Wreturn-type]
   }
   ^
  creating build/lib.mingw64_nt-6.1-2.9.0(0.318
  creating build/lib.mingw64_nt-6.1-2.9.0(0.318/5
  creating build/lib.mingw64_nt-6.1-2.9.0(0.318/5/3)-x86_64-3.6
  gcc -shared -Wl,--enable-auto-image-base -pipe -L. build/temp.mingw64_nt-6.1-2.9.0(0.318/5/3)-x86_64-3.6/src/btefmodule.o -L/usr/lib/python3.6/config -L/usr/lib -lpython3.6m -o build/lib.mingw64_nt-6.1-2.9.0(0.318/5/3)-x86_64-3.6/btef.cpython-36m.dll
  build/temp.mingw64_nt-6.1-2.9.0(0.318/5/3)-x86_64-3.6/src/btefmodule.o: In function `set_encoding':
  /tmp/pip-build-le6ys8sd/btef/src/btefmodule.c:11: undefined reference to `PyFile_Check'
  /tmp/pip-build-le6ys8sd/btef/src/btefmodule.c:16: undefined reference to `PyFile_SetEncoding'
  build/temp.mingw64_nt-6.1-2.9.0(0.318/5/3)-x86_64-3.6/src/btefmodule.o: In function `initbtef':
  /tmp/pip-build-le6ys8sd/btef/src/btefmodule.c:37: undefined reference to `Py_InitModule3'
  collect2.exe: error: ld returned 1 exit status
  error: command 'gcc' failed with exit status 1
  
  ----------------------------------------
  Failed building wheel for btef
  Running setup.py clean for btef
Failed to build btef
Installing collected packages: btef
  Running setup.py install for btef: started
    Running setup.py install for btef: finished with status 'error'
    Complete output from command /usr/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-le6ys8sd/btef/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /tmp/pip-i0x10smp-record/install-record.txt --single-version-externally-managed --compile:
    running install
    running build
    running build_ext
    building 'btef' extension
    creating build/temp.mingw64_nt-6.1-2.9.0(0.318/5/3)-x86_64-3.6
    creating build/temp.mingw64_nt-6.1-2.9.0(0.318/5/3)-x86_64-3.6/src
    x86_64-pc-msys-gcc -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -march=x86-64 -mtune=generic -O2 -pipe -I/usr/include/python3.6m -c src/btefmodule.c -o build/temp.mingw64_nt-6.1-2.9.0(0.318/5/3)-x86_64-3.6/src/btefmodule.o
    src/btefmodule.c: In function ‘set_encoding’:
    src/btefmodule.c:11:10: warning: implicit declaration of function ‘PyFile_Check’ [-Wimplicit-function-declaration]
         if (!PyFile_Check(f)) {
              ^~~~~~~~~~~~
    src/btefmodule.c:16:5: warning: implicit declaration of function ‘PyFile_SetEncoding’ [-Wimplicit-function-declaration]
         PyFile_SetEncoding(f, encoding);
         ^~~~~~~~~~~~~~~~~~
    src/btefmodule.c: In function ‘initbtef’:
    src/btefmodule.c:37:12: warning: implicit declaration of function ‘Py_InitModule3’ [-Wimplicit-function-declaration]
         (void) Py_InitModule3("btef", BtefMethods, btef_module_doc);
                ^~~~~~~~~~~~~~
    src/btefmodule.c:38:1: warning: control reaches end of non-void function [-Wreturn-type]
     }
     ^
    creating build/lib.mingw64_nt-6.1-2.9.0(0.318/5/3)-x86_64-3.6
    gcc -shared -Wl,--enable-auto-image-base -pipe -L. build/temp.mingw64_nt-6.1-2.9.0(0.318/5/3)-x86_64-3.6/src/btefmodule.o -L/usr/lib/python3.6/config -L/usr/lib -lpython3.6m -o build/lib.mingw64_nt-6.1-2.9.0(0.318/5/3)-x86_64-3.6/btef.cpython-36m.dll
    build/temp.mingw64_nt-6.1-2.9.0(0.318/5/3)-x86_64-3.6/src/btefmodule.o: In function `set_encoding':
    /tmp/pip-build-le6ys8sd/btef/src/btefmodule.c:11: undefined reference to `PyFile_Check'
    /tmp/pip-build-le6ys8sd/btef/src/btefmodule.c:16: undefined reference to `PyFile_SetEncoding'
    build/temp.mingw64_nt-6.1-2.9.0(0.318/5/3)-x86_64-3.6/src/btefmodule.o: In function `initbtef':
    /tmp/pip-build-le6ys8sd/btef/src/btefmodule.c:37: undefined reference to `Py_InitModule3'
    collect2.exe: error: ld returned 1 exit status
    error: command 'gcc' failed with exit status 1
    
    ----------------------------------------
Command "/usr/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-le6ys8sd/btef/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /tmp/pip-i0x10smp-record/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /tmp/pip-build-le6ys8sd/btef/