Make proper autoconf test for availability of posix nan function instead of fudging with the NAN macro.

darcs-hash:20090202232049-ac50b-0176955677ff39fdd05eeefa20dca883863c34e6.gz

1 files changed, 3 insertions, 2 deletions

diff --git a/fallback.h b/fallback.h
index 68bbcff4..e4813fb2 100644
--- a/fallback.h
+++ b/fallback.h
@@ -469,8 +469,9 @@ long sysconf(int name);
 
 #endif
 
-#ifndef NAN
-#define NAN (0.0/0.0)
+#ifndef HAVE_NAN
+double nan(char *tagp);
 #endif
 
+
 #endif