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$ apperlm install-build-deps
$ apperlm init --name initial_build_config --base full
$ apperlm checkout initial_build_config
$ apperlm configure
$ apperlm build

$ ./perl.com -v

...
  Platform:
    osname=cosmo
...

C:\Users\ken\tmp>apperl -v

...
  Platform:
    osname=cosmo
...

$ ./perl.com -v

...
  Platform:
    osname=cosmo
...

$ perl -E 'say $^O'
linux
...
File::Spec::Unix
$ ./perl.com -E 'use File::Spec; say for @File::Spec::ISA;'
File::Spec::Unix

C:\Users\ken\tmp>perl -E "say $^O"
MSWin32
...
File::Spec::Win32
C:\Users\ken\tmp>apperl -E "use File::Spec; say for @File::Spec::ISA;"
File::Spec::Unix

$ perl -E 'say $^O'
cygwin
...
File::Spec::Cygwin
$ ./perl.com -E 'use File::Spec; say for @File::Spec::ISA;'
File::Spec::Unix

# Win10
C:\Users\ken\tmp>apperl --assimilate
...
# Cygwin
$ ./perl.com --assimilate
Unrecognized switch: --assimilate  (-h will show valid options).