diff --git a/autoconf/m4/func_isinf.m4 b/autoconf/m4/func_isinf.m4
index 22ba81d54d5..40dc48b2b8a 100644
--- a/autoconf/m4/func_isinf.m4
+++ b/autoconf/m4/func_isinf.m4
@@ -1,34 +1,40 @@
-#
-# This function determins if the isinf function isavailable on this
-# platform.
-#
+dnl
+dnl This function determins if the isinf function isavailable on this
+dnl platform.
+dnl
+
 AC_DEFUN([AC_FUNC_ISINF],[
+
 AC_SINGLE_CXX_CHECK([ac_cv_func_isinf_in_math_h],   
                     [isinf], [<math.h>],
                     [float f; isinf(f);])
 if test "$ac_cv_func_isinf_in_math_h" = "yes" ; then 
-  AC_DEFINE([HAVE_ISINF_IN_MATH_H],1,[Set to 1 if the isinf function is found in <math.h>])
+  AC_DEFINE([HAVE_ISINF_IN_MATH_H], [1],
+            [Set to 1 if the isinf function is found in <math.h>])
 fi
 
 AC_SINGLE_CXX_CHECK([ac_cv_func_isinf_in_cmath],    
                     [isinf], [<cmath>],
                     [float f; isinf(f);])
 if test "$ac_cv_func_isinf_in_cmath" = "yes" ; then
-  AC_DEFINE([HAVE_ISINF_IN_CMATH],1,[Set to 1 if the isinf function is found in <cmath>])
+  AC_DEFINE([HAVE_ISINF_IN_CMATH], [1],
+            [Set to 1 if the isinf function is found in <cmath>])
 fi
 
 AC_SINGLE_CXX_CHECK([ac_cv_func_std_isinf_in_cmath],
                     [std::isinf], [<cmath>],
                     [float f; std::isinf(f);])
 if test "$ac_cv_func_std_isinf_in_cmath" = "yes" ; then 
-  AC_DEFINE([HAVE_STD_ISINF_IN_CMATH],1,[Set to 1 if the std::isinf function is found in <cmath>])
+  AC_DEFINE([HAVE_STD_ISINF_IN_CMATH], [1],
+            [Set to 1 if the std::isinf function is found in <cmath>])
 fi
 
 AC_SINGLE_CXX_CHECK([ac_cv_func_finite_in_ieeefp_h],
                     [finite], [<ieeefp.h>],
                     [float f; finite(f);])
 if test "$ac_cv_func_finite_in_ieeefp_h" = "yes" ; then
-  AC_DEFINE([HAVE_FINITE_IN_IEEEFP_H],1,[Set to 1 if the finite function is found in <ieeefp.h>])
+  AC_DEFINE([HAVE_FINITE_IN_IEEEFP_H], [1],
+            [Set to 1 if the finite function is found in <ieeefp.h>])
 fi
 
 ])
diff --git a/configure b/configure
index d4687590183..1ad1dac27b3 100755
--- a/configure
+++ b/configure
@@ -19897,6 +19897,7 @@ _ACEOF
 fi
 
 
+
 { echo "$as_me:$LINENO: checking for isinf in <math.h>" >&5
 echo $ECHO_N "checking for isinf in <math.h>... $ECHO_C" >&6; }
 if test "${ac_cv_func_isinf_in_math_h+set}" = set; then