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-rw-r--r--ext/date/extconf.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/date/extconf.rb b/ext/date/extconf.rb
index f891de403d..358f64173a 100644
--- a/ext/date/extconf.rb
+++ b/ext/date/extconf.rb
@@ -3,6 +3,7 @@ require 'mkmf'
config_string("strict_warnflags") {|w| $warnflags += " #{w}"}
+have_func("rb_category_warn")
with_werror("", {:werror => true}) do |opt, |
have_var("timezone", "time.h", opt)
have_var("altzone", "time.h", opt)