[Python] on 3.8 pip install -> fatal error: 'arrow/util/thread-pool.h' file not found

[asfimport]

Hi, I'm trying to install pyarrow with python 3.8 using the following:

• brew install cmake
  brew install apache-arrow
  pip3 install pyarrow

  then receiving the following error:

• Running cmake --build for pyarrow
  cmake --build . --config release -
  Scanning dependencies of target _json_pyx
  [ 11%] Compiling Cython CXX source for _json...
  [ 11%] Built target _json_pyx
  Scanning dependencies of target _json
  [ 22%] Building CXX object CMakeFiles/_json.dir/_json.cpp.o
  /private/var/folders/sv/llx1n1tj69g2pbhyqtl9wbfr0000gn/T/pip-install-1n6yyvmk/pyarrow/build/temp.macosx-10.9-x86_64-3.8/_json.cpp:647:10: fatal error: 'arrow/util/thread-pool.h' file not found
  #include "arrow/util/thread-pool.h"
  ^~~~~~~~~~~~~~~~~~~~~~~~~~
  1 error generated.
  make[2]: *** [CMakeFiles/_json.dir/_json.cpp.o] Error 1
  make[1]: *** [CMakeFiles/_json.dir/all] Error 2
  make: *** [all] Error 2
  error: command 'cmake' failed with exit status 2

---

Environment: OS X 10.14.6 Python 3.8
Reporter: Yale Yng-Wong

_{Note: This issue was originally created as ARROW-7025. Please see the migration documentation for further details.}

[asfimport]

Wes McKinney / @wesm:
Seems like the Arrow headers aren't being properly added to the include path when compiling. Can you show the full command line as it's passed to the C++ compiler? Set export PYARROW_BUILD_VERBOSE=1 to see the compiler commands

[asfimport]

Wes McKinney / @wesm:
Wheels for py3.8 are available now