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-rw-r--r--ext/readline/extconf.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/readline/extconf.rb b/ext/readline/extconf.rb
index 09d42f69c9..63ece61464 100644
--- a/ext/readline/extconf.rb
+++ b/ext/readline/extconf.rb
@@ -1,7 +1,7 @@
require "mkmf"
dir_config("readline")
-have_library("user32", nil) if /cygwin/ === PLATFORM
+have_library("user32", nil) if /cygwin/ === RUBY_PLATFORM
have_library("termcap", "tgetnum") or
have_library("curses", "tgetnum") or
have_library("ncurses", "tgetnum")