glsl2: Give the path within src/mesa/ for headers instead of relying on -I.
diff --git a/src/glsl/glcpp/glcpp.h b/src/glsl/glcpp/glcpp.h
index 869de2e..0ccd957 100644
--- a/src/glsl/glcpp/glcpp.h
+++ b/src/glsl/glcpp/glcpp.h
@@ -28,7 +28,7 @@
 
 #include <talloc.h>
 
-#include "hash_table.h"
+#include "program/hash_table.h"
 
 #define yyscan_t void*