add prereqs

diff --git a/m4/canonicalize.m4 b/m4/canonicalize.m4
index d859de6d0a9806ecea45ffacc19fb63b0239f548..7e6276c5d5afa9687ea093e0a4fe219ddcfee386 100644 (file)
--- a/m4/canonicalize.m4
+++ b/m4/canonicalize.m4
@@ -1,9 +1,13 @@
 #serial 1
-# This would simply be AC_REPLACE_FUNC([canonicalize_file_name])
-# if the function name weren't so long.  Besides, I would rather
-# not have underscores in file names.
 AC_DEFUN([AC_FUNC_CANONICALIZE_FILE_NAME],
   [
-    dnl FIXME: add prerequisites here
-    AC_CHECK_FUNC(canonicalize_file_name, , [AC_LIBOBJ(canonicalize)])
+    AC_REQUIRE([AC_HEADER_STDC])
+    AC_CHECK_HEADERS(string.h sys/param.h stddef.h)
+    AC_CHECK_FUNCS(resolvepath)
+    AC_REQUIRE([AC_HEADER_STAT])
+
+    # This would simply be AC_REPLACE_FUNC([canonicalize_file_name])
+    # if the function name weren't so long.  Besides, I would rather
+    # not have underscores in file names.
+    AC_CHECK_FUNC([canonicalize_file_name], , [AC_LIBOBJ(canonicalize)])
   ])