diff --git a/acinclude.m4 b/acinclude.m4
index b6420954a..006d48711 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -1,50 +1,5 @@
 dnl UD macros for netcdf configure
 
-dnl 
-dnl UD_CHECK_IEEE
-dnl If the 'double' is not an IEEE double
-dnl or the 'float' is not and IEEE single,
-dnl define NO_IEEE_FLOAT
-dnl
-AC_DEFUN([UD_CHECK_IEEE],
-[
-AC_MSG_CHECKING(for IEEE floating point format)
-AC_TRY_RUN([#ifndef NO_FLOAT_H
-#include <float.h>
-#endif
-
-#define EXIT_NOTIEEE	1
-#define EXIT_MAYBEIEEE	0
-
-int
-main()
-{
-#if	defined(FLT_RADIX)	&& FLT_RADIX != 2
-		return EXIT_NOTIEEE;
-#elif	defined(DBL_MAX_EXP)	&& DBL_MAX_EXP != 1024
-		return EXIT_NOTIEEE;
-#elif	defined(DBL_MANT_DIG)	&& DBL_MANT_DIG != 53
-		return EXIT_NOTIEEE;
-#elif 	defined(FLT_MAX_EXP)	&& !(FLT_MAX_EXP == 1024 || FLT_MAX_EXP == 128)
-		return EXIT_NOTIEEE;
-#elif	defined(FLT_MANT_DIG)	&& !(FLT_MANT_DIG == 53 || FLT_MANT_DIG == 24)
-		return EXIT_NOTIEEE;
-#else
-	/* (assuming eight bit char) */
-	if(sizeof(double) != 8)
-		return EXIT_NOTIEEE;
-	if(!(sizeof(float) == 4 || sizeof(float) == 8))
-		return EXIT_NOTIEEE;
-
-	return EXIT_MAYBEIEEE;
-#endif
-}],ac_cv_c_ieeefloat=yes, ac_cv_c_ieeefloat=no, :)
-AC_MSG_RESULT($ac_cv_c_ieeefloat)
-if test "$ac_cv_c_ieeefloat" = no; then
-  AC_DEFINE([NO_IEEE_FLOAT], [], [no IEEE float on this platform])
-fi
-])
-
 
 dnl
 dnl Print which compilers are going to be used, the flags, and their
diff --git a/configure.ac b/configure.ac
index 33c85470e..38b186afe 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1492,7 +1492,6 @@ AC_SUBST(USEPLUGINS, [${enable_plugins}])
 AC_FUNC_ALLOCA
 AC_CHECK_DECLS([isnan, isinf, isfinite],,,[#include <math.h>])
 AC_CHECK_MEMBERS([struct stat.st_blksize])
-UD_CHECK_IEEE
 AC_CHECK_TYPES([size_t, ssize_t, schar, uchar, longlong, ushort, uint, int64, uint64, size64_t, ssize64_t, _off64_t, uint64_t, ptrdiff_t])
 AC_TYPE_OFF_T
 AC_TYPE_UINTPTR_T