AC_CONFIG_MACRO_DIR([m4])

Hi, Jim:

Autoconf printed a warning when reconfiguting Hail, so I gave up and
added this:

diff --git a/configure.ac b/configure.ac
index 9cfad23..d378854 100644
--- a/configure.ac
+++ b/configure.ac
@@ -62,6 +62,8 @@ AC_PROG_GCC_TRADITIONAL
 AM_PROG_CC_C_O
 AM_PROG_LIBTOOL
 
+AC_CONFIG_MACRO_DIR([m4])
+
 dnl Checks for header files.
 AC_HEADER_STDC
 dnl AC_CHECK_HEADERS(sys/ioctl.h unistd.h)

Now I have a directory m4/ with symlinks... This does not seem to be
helping any portability, unless I miss where the promised macro are
being saved locally. What was this about, do you happen to know?

-- Pete