From 372ea34407533932f5bbaa7d925b1369840f72d5 Mon Sep 17 00:00:00 2001
From: twisti <none@none>
Date: Thu, 12 Jan 2006 20:57:12 +0000
Subject: [PATCH] * Check explicitly for isnan.

---
 configure.in        | 9 +++++----
 src/fdlibm/fdlibm.h | 2 +-
 2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/configure.in b/configure.in
index bd7bae417..fefe5f67b 100644
--- a/configure.in
+++ b/configure.in
@@ -136,10 +136,11 @@ dnl Checks for library functions.
 AC_PROG_GCC_TRADITIONAL
 AC_TYPE_SIGNAL
 AC_FUNC_MEMCMP
-AC_CHECK_FUNCS(calloc mprotect getpagesize free)
-AC_CHECK_FUNCS(getcwd gettimeofday)
-AC_CHECK_FUNCS(scandir)
-AC_CHECK_FUNCS(mmap)
+AC_CHECK_FUNCS([calloc mprotect getpagesize free])
+AC_CHECK_FUNCS([getcwd gettimeofday])
+AC_CHECK_FUNCS([scandir])
+AC_CHECK_FUNCS([mmap])
+AC_CHECK_FUNCS([isnan])
 
 dnl Checks for libraries.
 
diff --git a/src/fdlibm/fdlibm.h b/src/fdlibm/fdlibm.h
index b1db4e8cf..d2d594cd0 100644
--- a/src/fdlibm/fdlibm.h
+++ b/src/fdlibm/fdlibm.h
@@ -94,7 +94,7 @@ extern double erfc __P((double));
 extern double gamma __P((double));
 extern double hypot __P((double, double));
 
-#ifndef isnan
+#if !defined(isnan) && !defined(HAVE_ISNAN)
 #define isnan(x) ((x) != (x))
 #endif
 
-- 
2.25.1