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--- ./configure.ac.orig
+++ ./configure.ac
@@ -2327,6 +2327,8 @@
fi
dnl Check for isinf
+ac_save_LIBS="$LIBS"
+LIBS="$LIBS -lm"
AC_CACHE_CHECK([for isinf], ac_cv_have_isinf,
AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <math.h>]], [[float f = 0.0; return isinf(f)]])],[ac_cv_have_isinf="yes"],[ac_cv_have_isinf="no"]))
if test "$ac_cv_have_isinf" = "yes"
@@ -2341,6 +2343,7 @@
then
AC_DEFINE(HAVE_ISNAN, 1, [Define to 1 if you have the `isnan' function.])
fi
+LIBS="$ac_save_LIBS"
dnl *** check for the need to define platform-specific symbols
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