diff -Naur Module-Build-0.4224/inc/Perl/OSType.pm Module-Build-0.4224-msys/inc/Perl/OSType.pm
--- Module-Build-0.4224/inc/Perl/OSType.pm	2017-05-30 21:03:05.000000000 +0300
+++ Module-Build-0.4224-msys/inc/Perl/OSType.pm	2018-02-14 12:07:45.377789700 +0300
@@ -54,6 +54,7 @@
   solaris     Unix
   sunos       Unix
   cygwin      Unix
+  msys        Unix
   os2         Unix
   interix     Unix
   gnu         Unix
diff -Naur Module-Build-0.4224/lib/Module/Build/Platform/msys.pm Module-Build-0.4224-msys/lib/Module/Build/Platform/msys.pm
--- Module-Build-0.4224/lib/Module/Build/Platform/msys.pm	1970-01-01 03:00:00.000000000 +0300
+++ Module-Build-0.4224-msys/lib/Module/Build/Platform/msys.pm	2018-02-14 12:41:13.498755300 +0300
@@ -0,0 +1,54 @@
+package Module::Build::Platform::msys;
+
+use strict;
+use warnings;
+our $VERSION = '0.4224';
+$VERSION = eval $VERSION;
+use Module::Build::Platform::Unix;
+
+our @ISA = qw(Module::Build::Platform::Unix);
+
+sub manpage_separator {
+   '.'
+}
+
+# Copied from ExtUtils::MM_Cygwin::maybe_command()
+# If our path begins with F</cygdrive/> then we use the Windows version
+# to determine if it may be a command.  Otherwise we use the tests
+# from C<ExtUtils::MM_Unix>.
+
+sub _maybe_command {
+    my ($self, $file) = @_;
+
+    if ($file =~ m{^/cygdrive/}i) {
+        require Module::Build::Platform::Windows;
+        return Module::Build::Platform::Windows->_maybe_command($file);
+    }
+
+    return $self->SUPER::_maybe_command($file);
+}
+
+1;
+__END__
+
+
+=head1 NAME
+
+Module::Build::Platform::msys - Builder class for MSYS2 platform
+
+=head1 DESCRIPTION
+
+This module provides some routines very specific to the msys2
+platform.
+
+Please see the L<Module::Build> for the general docs.
+
+=head1 AUTHOR
+
+Initial stub by Yitzchak Scott-Thoennes <sthoenna@efn.org>
+
+=head1 SEE ALSO
+
+perl(1), Module::Build(3), ExtUtils::MakeMaker(3)
+
+=cut
diff -Naur Module-Build-0.4224/META.json Module-Build-0.4224-msys/META.json
--- Module-Build-0.4224/META.json	2018-02-14 12:41:52.972323600 +0300
+++ Module-Build-0.4224-msys/META.json	2018-02-14 13:01:45.253677800 +0300
@@ -129,6 +129,10 @@
          "file" : "lib/Module/Build/Platform/cygwin.pm",
          "version" : "0.4224"
       },
+      "Module::Build::Platform::msys" : {
+         "file" : "lib/Module/Build/Platform/msys.pm",
+         "version" : "0.4224"
+      },
       "Module::Build::Platform::darwin" : {
          "file" : "lib/Module/Build/Platform/darwin.pm",
          "version" : "0.4224"
diff -Naur Module-Build-0.4224/META.yml Module-Build-0.4224-msys/META.yml
--- Module-Build-0.4224/META.yml	2017-05-30 21:03:05.000000000 +0300
+++ Module-Build-0.4224-msys/META.yml	2018-02-14 13:02:13.315584000 +0300
@@ -70,6 +70,9 @@
   Module::Build::Platform::cygwin:
     file: lib/Module/Build/Platform/cygwin.pm
     version: '0.4224'
+  Module::Build::Platform::msys:
+    file: lib/Module/Build/Platform/msys.pm
+    version: '0.4224'
   Module::Build::Platform::darwin:
     file: lib/Module/Build/Platform/darwin.pm
     version: '0.4224'
diff -Naur Module-Build-0.4224/t/destinations.t Module-Build-0.4224-msys/t/destinations.t
--- Module-Build-0.4224/t/destinations.t	2017-05-30 21:03:05.000000000 +0300
+++ Module-Build-0.4224-msys/t/destinations.t	2018-02-14 12:07:45.377789700 +0300
@@ -300,11 +300,11 @@
 sub have_same_ending {
   my ($dir1, $dir2, $message) = @_;
 
-  $dir1 =~ s{/$}{} if $^O eq 'cygwin'; # remove any trailing slash
+  $dir1 =~ s{/$}{} if $^O eq 'cygwin' || $^O eq 'msys'; # remove any trailing slash
   my (undef, $dirs1, undef) = splitpath $dir1;
   my @dir1 = splitdir $dirs1;
 
-  $dir2 =~ s{/$}{} if $^O eq 'cygwin'; # remove any trailing slash
+  $dir2 =~ s{/$}{} if $^O eq 'cygwin' || $^O eq 'msys'; # remove any trailing slash
   my (undef, $dirs2, undef) = splitpath $dir2;
   my @dir2 = splitdir $dirs2;