Add prototype for fpclassify

diff --git a/lib/libcompat.h b/lib/libcompat.h
index 050f29e9facdbfc3de07bda476a04ad8f1302875..9ec6eb817053df41b9c1a639fbc74dcfdfd0b0ca 100644 (file)
--- a/lib/libcompat.h
+++ b/lib/libcompat.h
@@ -83,6 +83,7 @@ extern double DOUBLE_ZERO;
 #endif
 #if !defined(isnan) || !defined(isinf) || !defined(isfinite)
 #define NEED_fpclassify
+extern int fpclassify(double d);
 #define FP_INFINITE (1)
 #define FP_NAN (2)
 #define FP_ZERO (4)