--- libev/libev.m4	2011/02/03 20:59:08	1.14
+++ libev/libev.m4	2011/02/20 02:56:23	1.15
@@ -16,7 +16,7 @@
                        #include <time.h>],
                       [struct timespec ts; int status = syscall (SYS_clock_gettime, CLOCK_REALTIME, &ts)])],
                      [ac_have_clock_syscall=1
-                      AC_DEFINE(HAVE_CLOCK_SYSCALL, 1, "use syscall interface for clock_gettime")
+                      AC_DEFINE(HAVE_CLOCK_SYSCALL, 1, Define to 1 to use the syscall interface for clock_gettime)
                       AC_MSG_RESULT(yes)],
                      [AC_MSG_RESULT(no)])
    fi
@@ -35,5 +35,8 @@
    fi
 ])
 
-AC_CHECK_LIB(m, ceil)
+if test -z "$LIBEV_M4_AVOID_LIBM"; then
+   LIBM=m
+fi
+AC_SEARCH_LIBS(floor, $LIBM, [AC_DEFINE(HAVE_FLOOR, 1, Define to 1 if the floor function is available)])