diff --git a/ORCACDefs/fenv.h b/ORCACDefs/fenv.h
new file mode 100644
index 0000000..2bbce18
--- /dev/null
+++ b/ORCACDefs/fenv.h
@@ -0,0 +1,45 @@
+/****************************************************************
+*
+*  fenv.h - floating-point environment access
+*
+*  February 2021
+*  Stephen Heumann
+*
+****************************************************************/
+
+#ifndef __fenv__
+#define __fenv__
+
+typedef unsigned short fenv_t;
+typedef unsigned short fexcept_t;
+
+/* Floating-point exceptions */
+#define FE_INVALID    0x01
+#define FE_UNDERFLOW  0x02
+#define FE_OVERFLOW   0x04
+#define FE_DIVBYZERO  0x08
+#define FE_INEXACT    0x10
+#define FE_ALL_EXCEPT 0x1F
+
+/* Rounding directions */
+#define FE_DOWNWARD   0x80
+#define FE_TONEAREST  0x00
+#define FE_TOWARDZERO 0xC0
+#define FE_UPWARD     0x40
+
+extern const fenv_t __FE_DFL_ENV;
+#define FE_DFL_ENV (&__FE_DFL_ENV)
+
+int feclearexcept(int);
+int fegetexceptflag(fexcept_t *, int);
+int feraiseexcept(int);
+int fesetexceptflag(const fexcept_t *, int);
+int fetestexcept(int);
+int fegetround(void);
+int fesetround(int);
+int fegetenv(fenv_t *);
+int feholdexcept(fenv_t *);
+int fesetenv(const fenv_t *);
+int feupdateenv(const fenv_t *);
+
+#endif