diff --git a/tools/as.py b/tools/as.py
index 72abbf2..3cc60b0 100644
--- a/tools/as.py
+++ b/tools/as.py
@@ -1,12 +1,14 @@
 import argparse
 import enum
 import lark
+import os
 import struct
 import sys
 
 import obj_pb2
 
-GRAMMAR_FILE = '/home/paulmathieu/vhdl/tools/as.ebnf'
+_HERE = os.path.dirname(__file__)
+GRAMMAR_FILE = os.path.join(_HERE, 'as.ebnf')
 
 opcodes = {
         'nop'  : lambda: '0000',
diff --git a/tools/cc.py b/tools/cc.py
index be0579f..47261de 100644
--- a/tools/cc.py
+++ b/tools/cc.py
@@ -6,6 +6,7 @@ from dataclasses import dataclass
 import importlib
 import inspect
 import io
+import os
 import re
 import struct
 import subprocess
@@ -15,7 +16,8 @@ import lark
 
 asmod = importlib.import_module("as")
 
-GRAMMAR_FILE = '/home/paulmathieu/vhdl/tools/cc.ebnf'
+_HERE = os.path.dirname(__file__)
+GRAMMAR_FILE = os.path.join(_HERE, 'cc.ebnf')
 CPP = ('cpp', '-P')
 
 
diff --git a/tools/ld.py b/tools/ld.py
index 7d9b2f4..e87f824 100644
--- a/tools/ld.py
+++ b/tools/ld.py
@@ -1,11 +1,13 @@
 import argparse
+import os
 import string
 import struct
 import sys
 
 import obj_pb2
 
-CRT0_FILE = '/home/paulmathieu/vhdl/tools/crt0.o'
+_HERE = os.path.dirname(__file__)
+CRT0_FILE = os.path.join(_HERE, 'ctr0.o')
 
 
 def parse_objs(objs):