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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 9f7d3e8..0547a3e 100644
--- a/ext/date/extconf.rb
+++ b/ext/date/extconf.rb
@@ -1,2 +1,3 @@
require 'mkmf'
+try_cflags("-std=iso9899:1999")
create_makefile('date_core')