1 files changed, 12 insertions, 0 deletions

diff --git a/lib/libF77/d_sign.c b/lib/libF77/d_sign.c
new file mode 100644
index 000000000000..514ff0bbff82
--- /dev/null
+++ b/lib/libF77/d_sign.c
@@ -0,0 +1,12 @@
+#include "f2c.h"
+
+#ifdef KR_headers
+double d_sign(a,b) doublereal *a, *b;
+#else
+double d_sign(doublereal *a, doublereal *b)
+#endif
+{
+double x;
+x = (*a >= 0 ? *a : - *a);
+return( *b >= 0 ? x : -x);
+}