fix ppm issue #40
Annotations
12 warnings
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                          macOS-latest (release)
                        
                      
                       unable to access index for repository https://bioconductor.org/packages/3.18/books/bin/macosx/big-sur-arm64/contrib/4.4: | 
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                          macOS-latest (release)
                        
                      
                       unable to access index for repository https://bioconductor.org/packages/3.18/workflows/bin/macosx/big-sur-arm64/contrib/4.4: | 
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                          macOS-latest (release)
                        
                      
                       unable to access index for repository https://bioconductor.org/packages/3.18/data/experiment/bin/macosx/big-sur-arm64/contrib/4.4: | 
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                          macOS-latest (release)
                        
                      
                       unable to access index for repository https://bioconductor.org/packages/3.18/data/annotation/bin/macosx/big-sur-arm64/contrib/4.4: | 
| 
                      
                          macOS-latest (release)
                        
                      
                       unable to access index for repository https://bioconductor.org/packages/3.18/bioc/bin/macosx/big-sur-arm64/contrib/4.4: | 
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                          macOS-latest (release)
                        
                      
                       HOMEBREW_NO_INSTALLED_DEPENDENTS_CHECK is set: not checking for outdated
dependents or dependents with broken linkage!
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                          macOS-latest (release)
                        
                      
                       pkgconf 2.4.3 is already installed and up-to-date.
To reinstall 2.4.3, run:
  brew reinstall pkgconf
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                          windows-latest (release)
                        
                      
                       unable to access index for repository https://bioconductor.org/packages/3.18/books/bin/windows/contrib/4.4: | 
| 
                      
                          windows-latest (release)
                        
                      
                       unable to access index for repository https://bioconductor.org/packages/3.18/workflows/bin/windows/contrib/4.4: | 
| 
                      
                          windows-latest (release)
                        
                      
                       unable to access index for repository https://bioconductor.org/packages/3.18/data/experiment/bin/windows/contrib/4.4: | 
| 
                      
                          windows-latest (release)
                        
                      
                       unable to access index for repository https://bioconductor.org/packages/3.18/data/annotation/bin/windows/contrib/4.4: | 
| 
                      
                          windows-latest (release)
                        
                      
                       unable to access index for repository https://bioconductor.org/packages/3.18/bioc/bin/windows/contrib/4.4: |