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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 bea7e6bdcd..7e35abdb0b 100644
--- a/lib/rdoc/options.rb
+++ b/lib/rdoc/options.rb
@@ -544,7 +544,7 @@ class Options
# so we'll bypass the test under Windows
def check_diagram
- return if RUBY_PLATFORM =~ /win/
+ return if RUBY_PLATFORM =~ /mswin|cygwin|mingw|bccwin/
ok = false
ver = nil