diff --git a/src/math/fma.c b/src/math/fma.c
index c53f3148bd83733fc2829be18f56c6563e12b851..f44ecda77a689b375ff184266ad199126d816d70 100644
--- a/src/math/fma.c
+++ b/src/math/fma.c
@@ -199,27 +199,37 @@ double fma(double x, double y, double z)
 	 * modes other than FE_TONEAREST are painful.
 	 */
 	if (spread < -DBL_MANT_DIG) {
+#ifdef FE_INEXACT
 		feraiseexcept(FE_INEXACT);
+#endif
+#ifdef FE_UNDERFLOW
 		if (!isnormal(z))
 			feraiseexcept(FE_UNDERFLOW);
+#endif
 		switch (oround) {
-		case FE_TONEAREST:
+		default: /* FE_TONEAREST */
 			return (z);
+#ifdef FE_TOWARDZERO
 		case FE_TOWARDZERO:
 			if (x > 0.0 ^ y < 0.0 ^ z < 0.0)
 				return (z);
 			else
 				return (nextafter(z, 0));
+#endif
+#ifdef FE_DOWNWARD
 		case FE_DOWNWARD:
 			if (x > 0.0 ^ y < 0.0)
 				return (z);
 			else
 				return (nextafter(z, -INFINITY));
-		default:        /* FE_UPWARD */
+#endif
+#ifdef FE_UPWARD
+		case FE_UPWARD:
 			if (x > 0.0 ^ y < 0.0)
 				return (nextafter(z, INFINITY));
 			else
 				return (z);
+#endif
 		}
 	}
 	if (spread <= DBL_MANT_DIG * 2)
diff --git a/src/math/fmaf.c b/src/math/fmaf.c
index 0dccf108471875e048b210e31408ef9525a23744..cc427fb5ac987b15cad113d02183145f7e3c1c68 100644
--- a/src/math/fmaf.c
+++ b/src/math/fmaf.c
@@ -54,7 +54,9 @@ float fmaf(float x, float y, float z)
 	 * If result is inexact, and exactly halfway between two float values,
 	 * we need to adjust the low-order bit in the direction of the error.
 	 */
+#ifdef FE_TOWARDZERO
 	fesetround(FE_TOWARDZERO);
+#endif
 	volatile double vxy = xy;  /* XXX work around gcc CSE bug */
 	double adjusted_result = vxy + z;
 	fesetround(FE_TONEAREST);
diff --git a/src/math/fmal.c b/src/math/fmal.c
index 200bd5a55ea06e8b655e06dc9ddc383a94df7348..3944c29298e108c861d1c0f6aee9a7fe6264ebdc 100644
--- a/src/math/fmal.c
+++ b/src/math/fmal.c
@@ -194,27 +194,37 @@ long double fmal(long double x, long double y, long double z)
 	 * modes other than FE_TONEAREST are painful.
 	 */
 	if (spread < -LDBL_MANT_DIG) {
+#ifdef FE_INEXACT
 		feraiseexcept(FE_INEXACT);
+#endif
+#ifdef FE_UNDERFLOW
 		if (!isnormal(z))
 			feraiseexcept(FE_UNDERFLOW);
+#endif
 		switch (oround) {
-		case FE_TONEAREST:
+		default: /* FE_TONEAREST */
 			return (z);
+#ifdef FE_TOWARDZERO
 		case FE_TOWARDZERO:
 			if (x > 0.0 ^ y < 0.0 ^ z < 0.0)
 				return (z);
 			else
 				return (nextafterl(z, 0));
+#endif
+#ifdef FE_DOWNWARD
 		case FE_DOWNWARD:
 			if (x > 0.0 ^ y < 0.0)
 				return (z);
 			else
 				return (nextafterl(z, -INFINITY));
-		default:        /* FE_UPWARD */
+#endif
+#ifdef FE_UPWARD
+		case FE_UPWARD:
 			if (x > 0.0 ^ y < 0.0)
 				return (nextafterl(z, INFINITY));
 			else
 				return (z);
+#endif
 		}
 	}
 	if (spread <= LDBL_MANT_DIG * 2)
diff --git a/src/math/lrint.c b/src/math/lrint.c
index 98d58ad06f9f7d6ec502792cf594c9096a6bc723..9754fa749f7cc5e13a67e2e0f28e2fe2cc6c6e44 100644
--- a/src/math/lrint.c
+++ b/src/math/lrint.c
@@ -49,8 +49,10 @@ dtype fn(type x)
 
 	feholdexcept(&env);
 	d = (dtype)roundit(x);
+#if defined(FE_INVALID) && defined(FE_INEXACT)
 	if (fetestexcept(FE_INVALID))
 		feclearexcept(FE_INEXACT);
+#endif
 	feupdateenv(&env);
 	return d;
 }