1 files changed, 1 insertions, 0 deletions

diff --git a/Rakefile b/Rakefile
index 9c0711453..ab5e6c6e6 100644
--- a/Rakefile
+++ b/Rakefile
@@ -2,6 +2,7 @@
 # Build description.
 # basic build file for mruby
 MRUBY_ROOT = File.dirname(File.expand_path(__FILE__))
+MRUBY_BUILD_HOST_IS_CYGWIN = RUBY_PLATFORM.include?('cygwin')
 
 # load build systems
 load "#{MRUBY_ROOT}/tasks/ruby_ext.rake"