I don't think this has anything to do with Fortran.
The full warning message is presumably like
Warning: S3 methods . . . were declared in NAMESPACE but not found
which according to google-fu happens if you are declaring methods from a
package that isn't loaded, in this case possibly dplyr.
On previous occasions, this has happened due to race conditions so that one
package is not completely updated before another is installed, and that could
well be the case if you see trouble on just the one platform, so maybe wait and
see if the warning goes away. Otherwise, check for missing dependencies.
> On 14 Aug 2018, at 17:00 , Wang, Zhu wrote:
>
> Hi all,
>
> For the R package bujar, the warnings below were generated on CRAN's Windows
> systems. The package uses some Fortran subroutines. I would appreciate any
> advice to eliminate the warnings. By the way, similar warnings were generated
> to some unrelated R packages as well:
> https://www.r-project.org/nosvn/R.check/r-oldrel-windows-ix86+x86_64/imputeTS-00check.html.
>
> Thanks in advance.
>
> Zhu Wang
>
> https://www.r-project.org/nosvn/R.check/r-devel-windows-ix86+x86_64/bujar-00check.html
>
>
> * installing *source* package 'bujar' ...
> ** package 'bujar' successfully unpacked and MD5 sums checked
> ** R
> ** data
> ** inst
> ** byte-compile and prepare package for lazy loading
> Warning: S3 methods '[.fun_list', '[.grouped_df', 'all.equal.tbl_df',
> 'anti_join.data.frame', 'anti_join.tbl_df', 'arrange.data.frame',
> 'arrange.default', 'arrange.grouped_df', 'arrange.tbl_df',
> 'arrange_.data.frame', 'arrange_.tbl_df', 'as.data.frame.grouped_df',
> 'as.data.frame.rowwise_df', 'as.data.frame.tbl_cube', 'as.data.frame.tbl_df',
> 'as.table.tbl_cube', 'as.tbl.data.frame', 'as.tbl.tbl', 'as.tbl_cube.array',
> 'as.tbl_cube.data.frame', 'as.tbl_cube.matrix', 'as.tbl_cube.table',
> 'as_data_frame.grouped_df', 'as_data_frame.tbl_cube', 'auto_copy.tbl_cube',
> 'auto_copy.tbl_df', 'cbind.grouped_df', 'collapse.data.frame',
> 'collect.data.frame', 'common_by.NULL', 'common_by.character',
> 'common_by.default', 'common_by.list', 'compute.data.frame',
> 'copy_to.DBIConnection', 'copy_to.src_local', 'default_missing.data.frame',
> 'default_missing.default', 'dim.tbl_cube', 'distinct.data.frame',
> 'distinct.default', 'distinct.grouped_df', 'distinct.tbl_df',
> 'distinct_.data.frame', 'distinct_.grouped
> _df', 'dist [... truncated]
> ** help
> *** installing help indices
> ** building package indices
> ** installing vignettes
> ** testing if installed package can be loaded
> *** arch - i386
> Warning: S3 methods '[.fun_list', '[.grouped_df', 'all.equal.tbl_df',
> 'anti_join.data.frame', 'anti_join.tbl_df', 'arrange.data.frame',
> 'arrange.default', 'arrange.grouped_df', 'arrange.tbl_df',
> 'arrange_.data.frame', 'arrange_.tbl_df', 'as.data.frame.grouped_df',
> 'as.data.frame.rowwise_df', 'as.data.frame.tbl_cube', 'as.data.frame.tbl_df',
> 'as.table.tbl_cube', 'as.tbl.data.frame', 'as.tbl.tbl', 'as.tbl_cube.array',
> 'as.tbl_cube.data.frame', 'as.tbl_cube.matrix', 'as.tbl_cube.table',
> 'as_data_frame.grouped_df', 'as_data_frame.tbl_cube', 'auto_copy.tbl_cube',
> 'auto_copy.tbl_df', 'cbind.grouped_df', 'collapse.data.frame',
> 'collect.data.frame', 'common_by.NULL', 'common_by.character',
> 'common_by.default', 'common_by.list', 'compute.data.frame',
> 'copy_to.DBIConnection', 'copy_to.src_local', 'default_missing.data.frame',
> 'default_missing.default', 'dim.tbl_cube', 'distinct.data.frame',
> 'distinct.default', 'distinct.grouped_df', 'distinct.tbl_df',
> 'distinct_.data.frame', 'distinct_.grouped
> _df', 'dist [... truncated]
> *** arch - x64
> Warning: S3 methods '[.fun_list', '[.grouped_df', 'all.equal.tbl_df',
> 'anti_join.data.frame', 'anti_join.tbl_df', 'arrange.data.frame',
> 'arrange.default', 'arrange.grouped_df', 'arrange.tbl_df',
> 'arrange_.data.frame', 'arrange_.tbl_df', 'as.data.frame.grouped_df',
> 'as.data.frame.rowwise_df', 'as.data.frame.tbl_cube', 'as.data.frame.tbl_df',
> 'as.table.tbl_cube', 'as.tbl.data.frame', 'as.tbl.tbl', 'as.tbl_cube.array',
> 'as.tbl_cube.data.frame', 'as.tbl_cube.matrix', 'as.tbl_cube.table',
> 'as_data_frame.grouped_df', 'as_data_frame.tbl_cube', 'auto_copy.tbl_cube',
> 'auto_copy.tbl_df', 'cbind.grouped_df', 'collapse.data.frame',
> 'collect.data.frame', 'common_by.NULL', 'common_by.character',
> 'common_by.default', 'common_by.list', 'compute.data.frame',
> 'copy_to.DBIConnection', 'copy_to.src_local', 'default_missing.data.frame',
> 'default_missing.default', 'dim.tbl_cube', 'distinct.data.frame',
> 'distinct.default', 'distinct.grouped_df', 'distinct.tbl_df',
> 'distinct_.data.frame', 'distinct_.grouped
> _df', 'dist [... truncated]
> * MD5 sums
> packaged installation of 'bujar' as bujar_0.2-3.zip
> * DONE (bujar)
> In R CMD INSTALL
>
>
> **Connecticut Children's Confidentiality Notice**
> This e-mail message, including any attachments, is for...{{drop
