Check for -lm. Then can check for frexp and logb.

3f469c2e · Roland McGrath · 4cc1b78a · 3f469c2e
Commit 3f469c2e authored Aug 10, 1993 by Roland McGrath
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configure1.in configure1.in +4 -1

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--- a/configure1.in
+++ b/configure1.in
@@ -1176,7 +1176,10 @@ if test "${HAVE_X11}" = "yes"; then
 fi

 AC_ALLOCA
-AC_HAVE_FUNCS(gettimeofday gethostname dup2 rename closedir mkdir rmdir random bcopy)
+
+# logb and frexp are found in -lm on most systems.
+AC_HAVE_LIBRARY(-lm)
+AC_HAVE_FUNCS(gettimeofday gethostname dup2 rename closedir mkdir rmdir random bcopy logb frexp)

 ok_so_far=true
 AC_FUNC_CHECK(socket, , ok_so_far=)