Hi all,

Firstly I must apologies if what I put here is extremely trivial, but I am a
complete newcomer to the Apache Arrow project and contributing to Apache in
general, but I am very keen to get involved.

I'm hoping to help where I can so I recently attempted to complete a build
following the instructions laid out in the 'Python Development' section of the
documentation here:

After completing the steps that specifically uses Conda I was able to create an
environment but when it comes to building I am unable to do so.

I am on macOS -- 10.14.6 and as outlined in the docs and here 
(https://stackoverflow.com/a/55798942/4521950) I used use 10.9.sdk instead
of the latest. I have both added this manually using ccmake and also defining it
like so:

cmake -DCMAKE_INSTALL_PREFIX=$ARROW_HOME \
      -DCMAKE_INSTALL_LIBDIR=lib \
      -DARROW_FLIGHT=ON \
      -DARROW_GANDIVA=ON \
      -DARROW_ORC=ON \
      -DARROW_PARQUET=ON \
      -DARROW_PYTHON=ON \
      -DARROW_PLASMA=ON \
      -DARROW_BUILD_TESTS=ON \
      -DCONDA_BUILD_SYSROOT=/opt/MacOSX10.9.sdk \
      -DARROW_DEPENDENCY_SOURCE=AUTO \
      ..

But it seems that whatever I try, I seem to get errors, the main only tripping
me up at the moment is:

-- Building using CMake version: 3.15.3
-- The C compiler identification is Clang 4.0.1
-- The CXX compiler identification is Clang 4.0.1
-- Check for working C compiler: /usr/local/anaconda3/envs/pyarrow-dev/bin/clang
-- Check for working C compiler: 
/usr/local/anaconda3/envs/pyarrow-dev/bin/clang -- broken
CMake Error at 
/usr/local/anaconda3/envs/pyarrow-dev/share/cmake-3.15/Modules/CMakeTestCCompiler.cmake:60
 (message):
  The C compiler

    "/usr/local/anaconda3/envs/pyarrow-dev/bin/clang"

  is not able to compile a simple test program.

  It fails with the following output:

    Change Dir: /Users/tallamjr/Github/arrow/cpp/build/CMakeFiles/CMakeTmp

    Run Build Command(s):/usr/local/bin/gmake cmTC_b252c/fast && 
/usr/local/bin/gmake -f CMakeFiles/cmTC_b252c.dir/build.make 
CMakeFiles/cmTC_b252c.dir/build
    gmake[1]: Entering directory 
'/Users/tallamjr/Github/arrow/cpp/build/CMakeFiles/CMakeTmp'
    Building C object CMakeFiles/cmTC_b252c.dir/testCCompiler.c.o
    /usr/local/anaconda3/envs/pyarrow-dev/bin/clang   -march=core2 
-mtune=haswell -mssse3 -ftree-vectorize -fPIC -fPIE -fstack-protector-strong 
-O2 -pipe  -isysroot /opt/MacOSX10.9.sdk   -o 
CMakeFiles/cmTC_b252c.dir/testCCompiler.c.o   -c 
/Users/tallamjr/Github/arrow/cpp/build/CMakeFiles/CMakeTmp/testCCompiler.c
    Linking C executable cmTC_b252c
    /usr/local/anaconda3/envs/pyarrow-dev/bin/cmake -E cmake_link_script 
CMakeFiles/cmTC_b252c.dir/link.txt --verbose=1
    /usr/local/anaconda3/envs/pyarrow-dev/bin/clang -march=core2 -mtune=haswell 
-mssse3 -ftree-vectorize -fPIC -fPIE -fstack-protector-strong -O2 -pipe  
-isysroot /opt/MacOSX10.9.sdk -Wl,-search_paths_first 
-Wl,-headerpad_max_install_names -Wl,-pie -Wl,-headerpad_max_install_names 
-Wl,-dead_strip_dylibs  CMakeFiles/cmTC_b252c.dir/testCCompiler.c.o  -o 
cmTC_b252c
    ld: warning: ignoring file 
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/usr/lib/libSystem.tbd,
 file was built for unsupported file format ( 0x2D 0x2D 0x2D 0x20 0x21 0x74 
0x61 0x70 0x69 0x2D 0x74 0x62 0x64 0x2D 0x76 0x33 ) which is not the 
architecture being linked (x86_64): 
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/usr/lib/libSystem.tbd
    ld: dynamic main executables must link with libSystem.dylib for 
architecture x86_64
    clang-4.0: error: linker command failed with exit code 1 (use -v to see 
invocation)
    gmake[1]: *** [CMakeFiles/cmTC_b252c.dir/build.make:87: cmTC_b252c] Error 1
    gmake[1]: Leaving directory 
'/Users/tallamjr/Github/arrow/cpp/build/CMakeFiles/CMakeTmp'
    gmake: *** [Makefile:121: cmTC_b252c/fast] Error 2


  CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
  CMakeLists.txt:32 (project)

-- Configuring incomplete, errors occurred!
See also "/Users/tallamjr/Github/arrow/cpp/build/CMakeFiles/CMakeOutput.log".
See also "/Users/tallamjr/Github/arrow/cpp/build/CMakeFiles/CMakeError.log".

Does anyone have any insight as to what might be happening and causing this to
fail. I notice that eventhough I set to CONDA_BUILD_SYSROOT to
/opt/MacOSX10.9.sdk I also see that ld is looking in MacOSX10.14.sdk, I assume
that is not right..

I have tried to compare steps with ones outlined in
https://lists.apache.org/list.html?dev@arrow.apache.org:2019-8 and in other
corners of the internet but I feel very stuck at the moment. 

Any help would be greatly appreciated! Thank you

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