Install fails on Mac running python 3.10.17

[Skruput]

Hi,

running python 10.10.17 on an Apple M1

 >  pip install librosa 

fails, giving the following error log:

. . . 
  Preparing metadata (pyproject.toml) ... error
  error: subprocess-exited-with-error

    × Preparing metadata (pyproject.toml) did not run successfully.

  │ exit code: 1

  ╰─> [53 lines of output]

      + meson setup /private/var/folders/g8/r8sp7wpx5qd2lzkwr59r25kc0000gn/T/pip-install-0lcp4nz8/scipy_1496da7430cc48b5986eb3741f7980f1 /private/var/folders/g8/r8sp7wpx5qd2lzkwr59r25kc0000gn/T/pip-install-0lcp4nz8/scipy_1496da7430cc48b5986eb3741f7980f1/.mesonpy-4p0e7cbt -Dbuildtype=release -Db_ndebug=if-release -Db_vscrt=md --native-file=/private/var/folders/g8/r8sp7wpx5qd2lzkwr59r25kc0000gn/T/pip-install-0lcp4nz8/scipy_1496da7430cc48b5986eb3741f7980f1/.mesonpy-4p0e7cbt/meson-python-native-file.ini

      The Meson build system
      Version: 1.7.2

      Source dir: /private/var/folders/g8/r8sp7wpx5qd2lzkwr59r25kc0000gn/T/pip-install-0lcp4nz8/scipy_1496da7430cc48b5986eb3741f7980f1

      Build dir: /private/var/folders/g8/r8sp7wpx5qd2lzkwr59r25kc0000gn/T/pip-install-0lcp4nz8/scipy_1496da7430cc48b5986eb3741f7980f1/.mesonpy-4p0e7cbt

      Build type: native build
      Project name: scipy
      Project version: 1.15.2

      C compiler for the host machine: cc (clang 12.0.5 "Apple clang version 12.0.5 (clang-1205.0.22.11)")

      C linker for the host machine: cc ld64 650.9
      C++ compiler for the host machine: c++ (clang 12.0.5 "Apple clang version 12.0.5 (clang-1205.0.22.11)")
      C++ linker for the host machine: c++ ld64 650.9
      Cython compiler for the host machine: cython (cython 3.0.12)
      Host machine cpu family: aarch64
      Host machine cpu: aarch64
      Program python found: YES (/opt/homebrew/Cellar/pyt...@3.10/3.10.17/bin/python3.10)
      Found pkg-config: YES (/opt/homebrew/bin/pkg-config) 2.4.3
      Run-time dependency python found: YES 3.10
      Program cython found: YES (/private/var/folders/g8/r8sp7wpx5qd2lzkwr59r25kc0000gn/T/pip-build-env-98qrw_2e/overlay/bin/cython)
      Compiler for C supports arguments -Wno-unused-but-set-variable: NO
      Compiler for C supports arguments -Wno-unused-function: YES
      Compiler for C supports arguments -Wno-conversion: YES
      Compiler for C supports arguments -Wno-misleading-indentation: YES
      Library m found: YES
      ../meson.build:80:0: ERROR: Unknown compiler(s): [['gfortran'], ['flang-new'], ['flang'], ['nvfortran'], ['pgfortran'], ['ifort'], ['ifx'], ['g95']]

      The following exception(s) were encountered:
      Running `gfortran --help` gave "[Errno 2] No such file or directory: 'gfortran'"
      Running `gfortran --version` gave "[Errno 2] No such file or directory: 'gfortran'"
      Running `gfortran -V` gave "[Errno 2] No such file or directory: 'gfortran'"
      Running `flang-new --help` gave "[Errno 2] No such file or directory: 'flang-new'"
      Running `flang-new --version` gave "[Errno 2] No such file or directory: 'flang-new'"
      Running `flang-new -V` gave "[Errno 2] No such file or directory: 'flang-new'"
      Running `flang --help` gave "[Errno 2] No such file or directory: 'flang'"
      Running `flang --version` gave "[Errno 2] No such file or directory: 'flang'"
      Running `flang -V` gave "[Errno 2] No such file or directory: 'flang'"
      Running `nvfortran --help` gave "[Errno 2] No such file or directory: 'nvfortran'"
      Running `nvfortran --version` gave "[Errno 2] No such file or directory: 'nvfortran'"
      Running `nvfortran -V` gave "[Errno 2] No such file or directory: 'nvfortran'"
      Running `pgfortran --help` gave "[Errno 2] No such file or directory: 'pgfortran'"
      Running `pgfortran --version` gave "[Errno 2] No such file or directory: 'pgfortran'"
      Running `pgfortran -V` gave "[Errno 2] No such file or directory: 'pgfortran'"
      Running `ifort --help` gave "[Errno 2] No such file or directory: 'ifort'"
      Running `ifort --version` gave "[Errno 2] No such file or directory: 'ifort'"
      Running `ifort -V` gave "[Errno 2] No such file or directory: 'ifort'"
      Running `ifx --help` gave "[Errno 2] No such file or directory: 'ifx'"
      Running `ifx --version` gave "[Errno 2] No such file or directory: 'ifx'"
      Running `ifx -V` gave "[Errno 2] No such file or directory: 'ifx'"
      Running `g95 --help` gave "[Errno 2] No such file or directory: 'g95'"
      Running `g95 --version` gave "[Errno 2] No such file or directory: 'g95'"
      Running `g95 -V` gave "[Errno 2] No such file or directory: 'g95'"

    note: This error originates from a subprocess, and is likely not a problem with pip.

error: metadata-generation-failed
× Encountered error while generating package metadata.

╰─> See above for output.

note: This is an issue with the package mentioned above, not pip.
hint: See above for details.

Does anybody have a clue what's causing this?

Do I have to install gfortran and all the rest that can't be found?

[Brian McFee]

The problem is that you're installing scipy from source, but don't have the proper compilation tools to support that (ie gfortran and friends).  So yes, you would need to install gfortran if you want to install from source.

If you don't want to do that, I would strongly recommend to use conda packages instead of pypi (pip), as they should have pre-compiled versions of all mainline scientific python packages for your platform.