diff --git a/sysdeps/alpha/fpu/bits/mathdef.h b/sysdeps/alpha/fpu/bits/mathdef.h
index 3b80e82475..2750af8cd8 100644
--- a/sysdeps/alpha/fpu/bits/mathdef.h
+++ b/sysdeps/alpha/fpu/bits/mathdef.h
@@ -58,9 +58,6 @@ typedef double double_t;
 typedef double float_t;
 typedef double double_t;
 
-/* Strange compiler, we don't know how it works.  */
-#  define FLT_EVAL_METHOD	-1
-
 /* Define `INFINITY' as value of type `float'.  */
 #  define INFINITY	HUGE_VALF
 
@@ -70,9 +67,6 @@ typedef double double_t;
 # define FP_ILOGB0     (-2147483647)
 # define FP_ILOGBNAN   (2147483647)
 
-/* Number of decimal digits for the `double' type.  */
-# define DECIMAL_DIG	15
-
 #endif	/* ISO C99 */
 
 #ifndef __NO_LONG_DOUBLE_MATH
diff --git a/sysdeps/arm/fpu/bits/mathdef.h b/sysdeps/arm/fpu/bits/mathdef.h
index 374ad674c3..426fec7247 100644
--- a/sysdeps/arm/fpu/bits/mathdef.h
+++ b/sysdeps/arm/fpu/bits/mathdef.h
@@ -29,9 +29,6 @@ typedef float float_t;		/* `float' expressions are evaluated as
 typedef double double_t;	/* `double' expressions are evaluated as
 				   `double'.  */
 
-/* Signal that types stay as they were declared.  */
-# define FLT_EVAL_METHOD	0
-
 /* Define `INFINITY' as value of type `float'.  */
 # define INFINITY	HUGE_VALF
 
@@ -40,9 +37,6 @@ typedef double double_t;	/* `double' expressions are evaluated as
 # define FP_ILOGB0	(-2147483647)
 # define FP_ILOGBNAN	(2147483647)
 
-/* Number of decimal digits for the `double' type.  */
-# define DECIMAL_DIG	15
-
 #endif	/* ISO C99 */
 
 #ifndef __NO_LONG_DOUBLE_MATH
diff --git a/sysdeps/m68k/fpu/bits/mathdef.h b/sysdeps/m68k/fpu/bits/mathdef.h
index c3365a7ff2..4eec5d8cc4 100644
--- a/sysdeps/m68k/fpu/bits/mathdef.h
+++ b/sysdeps/m68k/fpu/bits/mathdef.h
@@ -31,9 +31,6 @@ typedef long double float_t;	/* `float' expressions are evaluated as
 typedef long double double_t;	/* `double' expressions are evaluated as
 				   `long double'.  */
 
-/* Signal that both types are `long double'.  */
-# define FLT_EVAL_METHOD	2
-
 /* Define `INFINITY' as value of type `float'.  */
 # define INFINITY	HUGE_VALF
 
@@ -41,7 +38,4 @@ typedef long double double_t;	/* `double' expressions are evaluated as
 # define FP_ILOGB0	(-2147483647 - 1)
 # define FP_ILOGBNAN	(2147483647)
 
-/* Number of decimal digits for the `long double' type.  */
-# define DECIMAL_DIG	18
-
 #endif	/* ISO C99 */