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-rw-r--r--ext/bigdecimal/extconf.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/bigdecimal/extconf.rb b/ext/bigdecimal/extconf.rb
index d5140e8..c92aacb 100644
--- a/ext/bigdecimal/extconf.rb
+++ b/ext/bigdecimal/extconf.rb
@@ -66,6 +66,7 @@ have_func("llabs", "stdlib.h")
have_func("finite", "math.h")
have_func("isfinite", "math.h")
+have_header("ruby/atomic.h")
have_header("ruby/internal/has/builtin.h")
have_header("ruby/internal/static_assert.h")