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-rw-r--r--lib/rdoc/options.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/rdoc/options.rb b/lib/rdoc/options.rb
index 02ee75ee0c..078635121c 100644
--- a/lib/rdoc/options.rb
+++ b/lib/rdoc/options.rb
@@ -567,7 +567,7 @@ Usage: #{opt.program_name} [options] [names...]
# Windows.
def check_diagram
- return if RUBY_PLATFORM =~ /mswin/
+ return if RUBY_PLATFORM =~ /mswin|cygwin|mingw|bccwin/
ok = false
ver = nil