AX_PATH_BDB and -I/include, -L/lib

[Florian Weimer]

On Debian GNU/Linux systems, AX_PATH_BDB produces -I/include and
-L/lib flags by default.  The patch below fixes this.

----------------------------------------------------------------------
r687:  fw | 2004-12-04 17:35:09 +0100

* aclocal.m4 (AX_PATH_BDB_NO_OPTIONS):
  Suppress -I and -L if the Berkeley DB path is empty.

----------------------------------------------------------------------
=== enyo/trunk/aclocal.m4
==================================================================
--- enyo/trunk/aclocal.m4  (revision 686)
+++ enyo/trunk/aclocal.m4  (revision 687)
@@ -483,8 +483,10 @@
       if test "$ax_compare_version" = "true" ; then
         ax_path_bdb_no_options_ok=yes
         BDB_LIBS="-ldb"
-        BDB_CPPFLAGS="-I$ax_path_bdb_path_find_highest_DIR/include"
-        BDB_LDFLAGS="-L$ax_path_bdb_path_find_highest_DIR/lib"
+        if test "x$ax_path_bdb_path_find_highest_DIR" != x ; then
+          BDB_CPPFLAGS="-I$ax_path_bdb_path_find_highest_DIR/include"
+          BDB_LDFLAGS="-L$ax_path_bdb_path_find_highest_DIR/lib"
+        fi
         BDB_VERSION="$ax_path_bdb_path_find_highest_VERSION"
       fi
     fi