--- a/include/math.h
+++ b/include/math.h
+@@ -179,7 +179,7 @@
+
+
+ /* ISO C99 defines some generic macros which work on any data type. */
+-#ifdef __USE_ISOC99
++#if defined(__USE_ISOC99) || defined(__USE_BSD)
+
+ /* Get the architecture specific values describing the floating-point
+ evaluation. The following symbols will get defined:
@@ -299,6 +299,11 @@
#endif /* Use ISO C99. */
--- a/include/math.h
+++ b/include/math.h
+@@ -179,7 +179,7 @@
+
+
+ /* ISO C99 defines some generic macros which work on any data type. */
+-#ifdef __USE_ISOC99
++#if defined(__USE_ISOC99) || defined(__USE_BSD)
+
+ /* Get the architecture specific values describing the floating-point
+ evaluation. The following symbols will get defined:
@@ -299,6 +299,11 @@
#endif /* Use ISO C99. */