* 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/threads.c

@@ -64,11 +64,11 @@
 */
 
 #include <stdio.h>
-#include "_scm.h"
-#include "dynwind.h"
-#include "smob.h"
+#include "libguile/_scm.h"
+#include "libguile/dynwind.h"
+#include "libguile/smob.h"
 
-#include "threads.h"
+#include "libguile/threads.h"
 
 
 
@@ -139,7 +139,7 @@ SCM_REGISTER_PROC(s_signal_condition_variable, "signal-condition-variable", 1, 0
 #endif
 
 #ifdef USE_COOP_THREADS
-#include "coop-threads.c"
+#include "libguile/coop-threads.c"
 #endif
 
 
@@ -151,7 +151,7 @@ scm_init_threads (SCM_STACKITEM *i)
   scm_tc16_mutex = scm_make_smob_type ("mutex", sizeof (coop_m));
   scm_tc16_condvar = scm_make_smob_type ("condition-variable", sizeof (coop_c));
                                         
-#include "threads.x"
+#include "libguile/threads.x"
   /* Initialize implementation specific details of the threads support */
   scm_threads_init (i);
 }