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-rw-r--r--contrib/groff/pic/pic.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/contrib/groff/pic/pic.h b/contrib/groff/pic/pic.h
index 77e59c7..72485a3 100644
--- a/contrib/groff/pic/pic.h
+++ b/contrib/groff/pic/pic.h
@@ -24,11 +24,11 @@ Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#include <stdlib.h>
#include <errno.h>
-#ifndef MATH_H_DECLARES_HYPOT
+#ifdef NEED_DECLARATION_HYPOT
extern "C" {
double hypot(double, double);
}
-#endif
+#endif /* NEED_DECLARATION_HYPOT */
#include "assert.h"
#include "cset.h"
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