* Makefile.am (DEFS): Added. automake adds -I options to DEFS,

and we don't want that.
(INCLUDES): Removed all -I options except for the root source
directory and the root build directory.

* *.*: Change includes so that they always use the "prefixes"
libguile/, qt/, guile-readline/, or libltdl/.
(Thanks to Tim Mooney.)

libguile/guile.c

@@ -49,10 +49,10 @@
 #include <libguile.h>
 
 #ifdef HAVE_CONFIG_H
-#include <scmconfig.h>
+#include <libguile/scmconfig.h>
 #endif
 #ifdef DYNAMIC_LINKING
-#include <ltdl.h>
+#include <libltdl/ltdl.h>
 #endif
 
 /* Debugger interface (don't change the order of the following lines) */