diff --git a/bison/CMakeLists.txt b/bison/CMakeLists.txt
index 05e3ee8..f604a0a 100644
--- a/bison/CMakeLists.txt
+++ b/bison/CMakeLists.txt
@@ -11,6 +11,11 @@ file(GLOB SOURCE_FILES
     "src/*.c"
     "src/*.h"
 )
+# exclude some source files
+list(REMOVE_ITEM SOURCE_FILES "${CMAKE_CURRENT_SOURCE_DIR}/src/scan-code.c")
+list(REMOVE_ITEM SOURCE_FILES "${CMAKE_CURRENT_SOURCE_DIR}/src/scan-gram.c")
+list(REMOVE_ITEM SOURCE_FILES "${CMAKE_CURRENT_SOURCE_DIR}/src/scan-skel.c")
+
 
 # Add executable to build.
 add_executable(${PROJECT_NAME} 
diff --git a/common/misc/bitsetv-print.c b/common/misc/bitsetv-print.c
deleted file mode 100644
index e797556..0000000
--- a/common/misc/bitsetv-print.c
+++ /dev/null
@@ -1,71 +0,0 @@
-/* Bitset vectors.
-
-   Copyright (C) 2001-2002, 2004, 2006, 2009-2011 Free Software
-   Foundation, Inc.
-
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation, either version 3 of the License, or
-   (at your option) any later version.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
-
-#include <config.h>
-
-#include "bitsetv-print.h"
-
-#include <stdlib.h>
-
-/*--------------------------------------------------------.
-| Display the MATRIX array of SIZE bitsets of size SIZE.  |
-`--------------------------------------------------------*/
-
-void
-bitsetv_matrix_dump (FILE * out, const char *title, bitsetv bset)
-{
-  bitset_bindex i, j;
-  bitset_bindex hsize = bitset_size (bset[0]);
-
-  /* Title. */
-  fprintf (out, "%s BEGIN\n", title);
-
-  /* Column numbers. */
-  fputs ("   ", out);
-  for (i = 0; i < hsize; ++i)
-    putc (i / 10 ? '0' + i / 10 : ' ', out);
-  putc ('\n', out);
-  fputs ("   ", out);
-  for (i = 0; i < hsize; ++i)
-    fprintf (out, "%d", (int) (i % 10));
-  putc ('\n', out);
-
-  /* Bar. */
-  fputs ("  .", out);
-  for (i = 0; i < hsize; ++i)
-    putc ('-', out);
-  fputs (".\n", out);
-
-  /* Contents. */
-  for (i = 0; bset[i]; ++i)
-    {
-      fprintf (out, "%2lu|", (unsigned long int) i);
-      for (j = 0; j < hsize; ++j)
-	fputs (bitset_test (bset[i], j) ? "1" : " ", out);
-      fputs ("|\n", out);
-    }
-
-  /* Bar. */
-  fputs ("  `", out);
-  for (i = 0; i < hsize; ++i)
-    putc ('-', out);
-  fputs ("'\n", out);
-
-  /* End title. */
-  fprintf (out, "%s END\n\n", title);
-}
diff --git a/common/misc/bitsetv-print.h b/common/misc/bitsetv-print.h
deleted file mode 100644
index 49fecb2..0000000
--- a/common/misc/bitsetv-print.h
+++ /dev/null
@@ -1,28 +0,0 @@
-/* Bitset vectors.
-
-   Copyright (C) 2002, 2004, 2009-2011 Free Software Foundation, Inc.
-
-   Contributed by Akim Demaille (akim@freefriends.org).
-
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation, either version 3 of the License, or
-   (at your option) any later version.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
-
-#ifndef _BITSETV_PRINT_H
-#define _BITSETV_PRINT_H
-
-#include "bitsetv.h"
-
-/* Dump vector of bitsets as a matrix.  */
-extern void bitsetv_matrix_dump (FILE *, const char *, bitsetv);
-
-#endif  /* _BITSETV_H  */