ResolvePackageNotFound: m2w64_c_win-64 while building R package r-ffbase - r

Question

I'm trying to install an R package in my anaconda environment DS-ML i've created with conda skeleton. The environment has R and python installed in it.
The R package is called r-ffbase, and it is on CRAN repository.
I'm on C:\users\public. After typing:
conda skeleton cran ffbase
a skeleton folder named "r-ffbase" has been created successfully.
I get a conda exception while building the package -
conda.exceptions.ResolvePackageNotFound:
- m2w64_c_win-64
I couldn't find any package in any channel I think. Where can I get this package from?
And why do I need this package for?
This is for a windows 10 server (win64), with Anaconda installed with conda 4.7.12, numpy 1.16.5 and R version 3.6.1 in the DS-ML enviroment.
I've tried typing in the conda prompt:
conda build r-ffbase --R=3.6.1 --numpy=1.16.5
I get the following full error message:
(DS-ML) C:\Users\Public>conda build r-ffbase --R=3.6.1 --numpy=1.16.5
Adding in variants from internal_defaults
INFO:conda_build.variants:Adding in variants from internal_defaults
Adding in variants from config.variant
INFO:conda_build.variants:Adding in variants from config.variant
Attempting to finalize metadata for r-ffbase
INFO:conda_build.metadata:Attempting to finalize metadata for r-ffbase
Collecting package metadata (repodata.json): ...working... done
Solving environment: ...working... failed
Leaving build/test directories:
Work:
C:\ProgramData\Anaconda3\conda-bld\work
Test:
C:\ProgramData\Anaconda3\conda-bld\test_tmp
Leaving build/test environments:
Test:
source activate C:\ProgramData\Anaconda3\conda-bld\_test_env
Build:
source activate C:\ProgramData\Anaconda3\conda-bld\_build_env
Traceback (most recent call last):
File "C:\ProgramData\Anaconda3\lib\site-packages\conda_build\environ.py", line 756, in get_install_actions
actions = install_actions(prefix, index, specs, force=True)
File "C:\ProgramData\Anaconda3\lib\site-packages\conda\common\io.py", line 88, in decorated
return f(*args, **kwds)
File "C:\ProgramData\Anaconda3\lib\site-packages\conda\plan.py", line 474, in install_actions
txn = solver.solve_for_transaction(prune=prune, ignore_pinned=not pinned)
File "C:\ProgramData\Anaconda3\lib\site-packages\conda\core\solve.py", line 117, in solve_for_transaction
should_retry_solve)
File "C:\ProgramData\Anaconda3\lib\site-packages\conda\core\solve.py", line 158, in solve_for_diff
force_remove, should_retry_solve)
File "C:\ProgramData\Anaconda3\lib\site-packages\conda\core\solve.py", line 275, in solve_final_state
ssc = self._add_specs(ssc)
File "C:\ProgramData\Anaconda3\lib\site-packages\conda\core\solve.py", line 555, in _add_specs
explicit_pool = ssc.r._get_package_pool(self.specs_to_add)
File "C:\ProgramData\Anaconda3\lib\site-packages\conda\resolve.py", line 523, in _get_package_pool
pool = self.get_reduced_index(specs)
File "C:\ProgramData\Anaconda3\lib\site-packages\conda\common\io.py", line 88, in decorated
return f(*args, **kwds)
File "C:\ProgramData\Anaconda3\lib\site-packages\conda\resolve.py", line 544, in get_reduced_index
explicit_specs, features = self.verify_specs(explicit_specs)
File "C:\ProgramData\Anaconda3\lib\site-packages\conda\resolve.py", line 280, in verify_specs
raise ResolvePackageNotFound(bad_deps)
conda.exceptions.ResolvePackageNotFound:
- m2w64_c_win-64
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\ProgramData\Anaconda3\Scripts\conda-build-script.py", line 10, in <module>
sys.exit(main())
File "C:\ProgramData\Anaconda3\lib\site-packages\conda_build\cli\main_build.py", line 445, in main
execute(sys.argv[1:])
File "C:\ProgramData\Anaconda3\lib\site-packages\conda_build\cli\main_build.py", line 436, in execute
verify=args.verify, variants=args.variants)
File "C:\ProgramData\Anaconda3\lib\site-packages\conda_build\api.py", line 209, in build
notest=notest, need_source_download=need_source_download, variants=variants)
File "C:\ProgramData\Anaconda3\lib\site-packages\conda_build\build.py", line 2343, in build_tree
notest=notest,
File "C:\ProgramData\Anaconda3\lib\site-packages\conda_build\build.py", line 1334, in build
output_metas = expand_outputs([(m, need_source_download, need_reparse_in_env)])
File "C:\ProgramData\Anaconda3\lib\site-packages\conda_build\render.py", line 746, in expand_outputs
for (output_dict, m) in _m.copy().get_output_metadata_set(permit_unsatisfiable_variants=False):
File "C:\ProgramData\Anaconda3\lib\site-packages\conda_build\metadata.py", line 2047, in get_output_metadata_set
bypass_env_check=bypass_env_check)
File "C:\ProgramData\Anaconda3\lib\site-packages\conda_build\metadata.py", line 721, in finalize_outputs_pass
permit_unsatisfiable_variants=permit_unsatisfiable_variants)
File "C:\ProgramData\Anaconda3\lib\site-packages\conda_build\render.py", line 527, in finalize_metadata
exclude_pattern)
File "C:\ProgramData\Anaconda3\lib\site-packages\conda_build\render.py", line 390, in add_upstream_pins
permit_unsatisfiable_variants, exclude_pattern)
File "C:\ProgramData\Anaconda3\lib\site-packages\conda_build\render.py", line 378, in _read_upstream_pin_files
permit_unsatisfiable_variants=permit_unsatisfiable_variants)
File "C:\ProgramData\Anaconda3\lib\site-packages\conda_build\render.py", line 154, in get_env_dependencies
channel_urls=tuple(m.config.channel_urls))
File "C:\ProgramData\Anaconda3\lib\site-packages\conda_build\environ.py", line 758, in get_install_actions
raise DependencyNeedsBuildingError(exc, subdir=subdir)
conda_build.exceptions.DependencyNeedsBuildingError: Unsatisfiable dependencies for platform win-64: {'m2w64_c_win-64'}

Answer 1

in my recipe/meta.yaml:
change
requirements:
build:
- {{ compiler("c") }} # [unix]
- {{ compiler('m2w64_c') }} # [win]
- {{ compiler("fortran") }} # [unix]
- {{ compiler('m2w64_fortran') }} # [win]
to:
requirements:
build:
- {{ compiler("c") }} # [unix]
- m2w64-gcc [win]
- {{ compiler("fortran") }} # [unix]
- m2w64-gcc-fortran [win]