Revisions for untitled paste

+$ nix-build shell.nix
+warning: dumping very large path (> 256 MiB); this may run out of memory
+these derivations will be built:
+  /nix/store/x3lf9ivpp44jrg0xs7g54s2bcm4hy3fh-python3.7-pyarrow-0.16.0.drv
+  /nix/store/84fimi68k497kw148885szghzgz8jqfh-python3-3.7.6-env.drv
+  /nix/store/ajw3m90xa5c6bf3nv0q2p0qb8n40714c-nix-shell.drv
+building '/nix/store/x3lf9ivpp44jrg0xs7g54s2bcm4hy3fh-python3.7-pyarrow-0.16.0.drv'...
+Sourcing python-remove-tests-dir-hook
+Sourcing python-catch-conflicts-hook.sh
+Sourcing python-remove-bin-bytecode-hook.sh
+Sourcing setuptools-build-hook
+Using setuptoolsBuildPhase
+Using setuptoolsShellHook
+Sourcing pip-install-hook
+Using pipInstallPhase
+Sourcing python-imports-check-hook.sh
+Using pythonImportsCheckPhase
+unpacking sources
+unpacking source archive /nix/store/dfg93svp28859a6ifln64fa56g71qh97-pyarrow-0.16.0.tar.gz
+source root is pyarrow-0.16.0
+setting SOURCE_DATE_EPOCH to timestamp 1581069203 of file pyarrow-0.16.0/setup.cfg
+patching sources
+configuring
+fixing cmake files...
+cmake flags: -DCMAKE_FIND_USE_SYSTEM_PACKAGE_REGISTRY=OFF -DCMAKE_FIND_USE_PACKAGE_REGISTRY=OFF -DCMAKE_EXPORT_NO_PACKAGE_REGISTRY=ON -DCMAKE_BUILD_TYPE=Release -DCMAKE_SKIP_BUILD_RPATH=ON -DBUILD_TESTING=OFF -DCMAKE_INSTALL_LOCALEDIR=/nix/store/58ywnhwva52b5lfkbxi5ky0s51ylrb35-python3.7-pyarrow-0.16.0/share/locale -DCMAKE_INSTALL_LIBEXECDIR=/nix/store/58ywnhwva52b5lfkbxi5ky0s51ylrb35-python3.7-pyarrow-0.16.0/libexec -DCMAKE_INSTALL_LIBDIR=/nix/store/58ywnhwva52b5lfkbxi5ky0s51ylrb35-python3.7-pyarrow-0.16.0/lib -DCMAKE_INSTALL_DOCDIR=/nix/store/58ywnhwva52b5lfkbxi5ky0s51ylrb35-python3.7-pyarrow-0.16.0/share/doc/ -DCMAKE_INSTALL_INFODIR=/nix/store/58ywnhwva52b5lfkbxi5ky0s51ylrb35-python3.7-pyarrow-0.16.0/share/info -DCMAKE_INSTALL_MANDIR=/nix/store/58ywnhwva52b5lfkbxi5ky0s51ylrb35-python3.7-pyarrow-0.16.0/share/man -DCMAKE_INSTALL_OLDINCLUDEDIR=/nix/store/58ywnhwva52b5lfkbxi5ky0s51ylrb35-python3.7-pyarrow-0.16.0/include -DCMAKE_INSTALL_INCLUDEDIR=/nix/store/58ywnhwva52b5lfkbxi5ky0s51ylrb35-python3.7-pyarrow-0.16.0/include -DCMAKE_INSTALL_SBINDIR=/nix/store/58ywnhwva52b5lfkbxi5ky0s51ylrb35-python3.7-pyarrow-0.16.0/sbin -DCMAKE_INSTALL_BINDIR=/nix/store/58ywnhwva52b5lfkbxi5ky0s51ylrb35-python3.7-pyarrow-0.16.0/bin -DCMAKE_INSTALL_NAME_DIR=/nix/store/58ywnhwva52b5lfkbxi5ky0s51ylrb35-python3.7-pyarrow-0.16.0/lib -DCMAKE_POLICY_DEFAULT_CMP0025=NEW -DCMAKE_OSX_SYSROOT= -DCMAKE_OSX_ARCHITECTURES=x86_64 -DCMAKE_FIND_FRAMEWORK=last -DCMAKE_STRIP=/nix/store/nfs9wf6ipffr9g9ylzb4i9c1i607nxvq-binutils-2.31.1/bin/strip -DCMAKE_RANLIB=/nix/store/nfs9wf6ipffr9g9ylzb4i9c1i607nxvq-binutils-2.31.1/bin/ranlib -DCMAKE_AR=/nix/store/nfs9wf6ipffr9g9ylzb4i9c1i607nxvq-binutils-2.31.1/bin/ar -DCMAKE_C_COMPILER=gcc -DCMAKE_CXX_COMPILER=g++ -DCMAKE_INSTALL_PREFIX=/nix/store/58ywnhwva52b5lfkbxi5ky0s51ylrb35-python3.7-pyarrow-0.16.0
+-- The C compiler identification is GNU 9.2.0
+-- The CXX compiler identification is GNU 9.2.0
+-- Check for working C compiler: /nix/store/1wb31gzrjw055xl6d3igzj1gnajzlwbk-gcc-wrapper-9.2.0/bin/gcc
+-- Check for working C compiler: /nix/store/1wb31gzrjw055xl6d3igzj1gnajzlwbk-gcc-wrapper-9.2.0/bin/gcc -- works
+-- Detecting C compiler ABI info
+-- Detecting C compiler ABI info - done
+-- Detecting C compile features
+-- Detecting C compile features - done
+-- Check for working CXX compiler: /nix/store/1wb31gzrjw055xl6d3igzj1gnajzlwbk-gcc-wrapper-9.2.0/bin/g++
+-- Check for working CXX compiler: /nix/store/1wb31gzrjw055xl6d3igzj1gnajzlwbk-gcc-wrapper-9.2.0/bin/g++ -- works
+-- Detecting CXX compiler ABI info
+-- Detecting CXX compiler ABI info - done
+-- Detecting CXX compile features
+-- Detecting CXX compile features - done
+-- Performing Test CXX_SUPPORTS_SSE4_2
+-- Performing Test CXX_SUPPORTS_SSE4_2 - Success
+-- Performing Test CXX_SUPPORTS_ALTIVEC
+-- Performing Test CXX_SUPPORTS_ALTIVEC - Failed
+-- Performing Test CXX_SUPPORTS_ARMCRC
+-- Performing Test CXX_SUPPORTS_ARMCRC - Failed
+-- Performing Test CXX_SUPPORTS_ARMV8_CRC_CRYPTO
+-- Performing Test CXX_SUPPORTS_ARMV8_CRC_CRYPTO - Failed
+-- Arrow build warning level: PRODUCTION
+Using ld linker
+Configured for RELEASE build (set with cmake -DCMAKE_BUILD_TYPE={release,debug,...})
+-- Build Type: RELEASE
+-- Build output directory: /build/pyarrow-0.16.0/build/release
+-- Found PythonInterp: /nix/store/xb1mp0f16lv23rwhfdc1665v5r20jfmm-python3-3.7.6/bin/python (found version "3.7.6")
+-- Searching for Python libs in /nix/store/xb1mp0f16lv23rwhfdc1665v5r20jfmm-python3-3.7.6/lib64;/nix/store/xb1mp0f16lv23rwhfdc1665v5r20jfmm-python3-3.7.6/lib;/nix/store/xb1mp0f16lv23rwhfdc1665v5r20jfmm-python3-3.7.6/lib/python3.7/config-3.7m-x86_64-linux-gnu
+-- Looking for python3.7m
+-- Found Python lib /nix/store/xb1mp0f16lv23rwhfdc1665v5r20jfmm-python3-3.7.6/lib/libpython3.7m.so
+-- Found PythonLibs: /nix/store/xb1mp0f16lv23rwhfdc1665v5r20jfmm-python3-3.7.6/lib/libpython3.7m.so
+-- Found NumPy: version "1.18.2" /nix/store/hihhpr0g5kbgg7x8cyx2wibr9lvy08y0-python3.7-numpy-1.18.2/lib/python3.7/site-packages/numpy/core/include
+-- Searching for Python libs in /nix/store/xb1mp0f16lv23rwhfdc1665v5r20jfmm-python3-3.7.6/lib64;/nix/store/xb1mp0f16lv23rwhfdc1665v5r20jfmm-python3-3.7.6/lib;/nix/store/xb1mp0f16lv23rwhfdc1665v5r20jfmm-python3-3.7.6/lib/python3.7/config-3.7m-x86_64-linux-gnu
+-- Looking for python3.7m
+-- Found Python lib /nix/store/xb1mp0f16lv23rwhfdc1665v5r20jfmm-python3-3.7.6/lib/libpython3.7m.so
+-- Could NOT find PkgConfig (missing: PKG_CONFIG_EXECUTABLE)
+-- Found Arrow: /nix/store/d7r6px97aafsxs73r1h58gc2458la5sk-arrow-cpp-0.16.0/include (found version "0.16.0")
+-- Arrow version: 0.16.0 (CMake package configuration: Arrow)
+-- Arrow SO and ABI version: 16
+-- Arrow full SO version: 16.0.0
+-- Found the Arrow core shared library: /nix/store/d7r6px97aafsxs73r1h58gc2458la5sk-arrow-cpp-0.16.0/lib/libarrow.so
+-- Found the Arrow core import library:
+-- Found the Arrow core static library: /nix/store/d7r6px97aafsxs73r1h58gc2458la5sk-arrow-cpp-0.16.0/lib/libarrow.a
+-- Could NOT find ArrowPython (missing: ArrowPython_DIR)
+CMake Error at /nix/store/5xjfds17qlc9shcrbdp28mcxb2yxqxf5-cmake-3.16.5/share/cmake-3.16/Modules/FindPackageHandleStandardArgs.cmake:146 (message):
+  Could NOT find ArrowPython (missing: ARROW_PYTHON_INCLUDE_DIR
+  ARROW_PYTHON_LIB_DIR) (found version "0.16.0")
+Call Stack (most recent call first):
+  /nix/store/5xjfds17qlc9shcrbdp28mcxb2yxqxf5-cmake-3.16.5/share/cmake-3.16/Modules/FindPackageHandleStandardArgs.cmake:393 (_FPHSA_FAILURE_MESSAGE)
+  cmake_modules/FindArrowPython.cmake:76 (find_package_handle_standard_args)
+  CMakeLists.txt:204 (find_package)
+
+
+-- Configuring incomplete, errors occurred!
+See also "/build/pyarrow-0.16.0/build/CMakeFiles/CMakeOutput.log".
+See also "/build/pyarrow-0.16.0/build/CMakeFiles/CMakeError.log".
+builder for '/nix/store/x3lf9ivpp44jrg0xs7g54s2bcm4hy3fh-python3.7-pyarrow-0.16.0.drv' failed with exit code 1
+cannot build derivation '/nix/store/84fimi68k497kw148885szghzgz8jqfh-python3-3.7.6-env.drv': 1 dependencies couldn't be built
+cannot build derivation '/nix/store/ajw3m90xa5c6bf3nv0q2p0qb8n40714c-nix-shell.drv': 1 dependencies couldn't be built
+error: build of '/nix/store/ajw3m90xa5c6bf3nv0q2p0qb8n40714c-nix-shell.drv' failed