Be more consistant with paths in #includes.  Eventually, eliminate a bunch of -I flags.
diff --git a/src/mesa/tnl/t_pipeline.c b/src/mesa/tnl/t_pipeline.c
index c7188da..2a0ed88 100644
--- a/src/mesa/tnl/t_pipeline.c
+++ b/src/mesa/tnl/t_pipeline.c
@@ -25,11 +25,11 @@
  *    Keith Whitwell <keith@tungstengraphics.com>
  */
 
-#include "glheader.h"
-#include "context.h"
-#include "imports.h"
-#include "state.h"
-#include "mtypes.h"
+#include "main/glheader.h"
+#include "main/context.h"
+#include "main/imports.h"
+#include "main/state.h"
+#include "main/mtypes.h"
 
 #include "t_context.h"
 #include "t_pipeline.h"