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-rw-r--r--ext/mathn/rational/extconf.rb2
1 files changed, 0 insertions, 2 deletions
diff --git a/ext/mathn/rational/extconf.rb b/ext/mathn/rational/extconf.rb
index 23cff7a325..ba76306b7b 100644
--- a/ext/mathn/rational/extconf.rb
+++ b/ext/mathn/rational/extconf.rb
@@ -1,5 +1,3 @@
require "mkmf"
-$CPPFLAGS = "-DEXT_MATHN -DCANON -DCLCANON"
-
create_makefile "mathn/rational"