(Flogb): Error at run time if not supported.

diff --git a/src/floatfns.c b/src/floatfns.c
index 0e9003722d741897f761c9da56534c4a2d16bc1b..b51073b296ee99d030e0540738a825e161d1b08b 100644 (file)
--- a/src/floatfns.c
+++ b/src/floatfns.c
@@ -647,7 +647,8 @@ This is the same as the exponent of a float.")
     XSET (val, Lisp_Int, exp-1);
   }
 #else
-  Well, what *do* you have?
+  /* Would someone like to write code to emulate logb?  */
+  error ("`logb' not implemented on this operating system");
 #endif
 #endif