--- a/factmsieve.py
+++ b/factmsieve.py
@@ -1,3 +1,4 @@
+#!/usr/bin/env python
 # factmsieve.py - A Python driver for GGNFS and MSIEVE
 #
 # Copyright (c) 2010, Brian Gladman
@@ -56,9 +57,12 @@
 import time, subprocess, gzip, glob, math, tempfile, datetime
 import atexit, threading, collections, multiprocessing, platform
 
+# need to save pwd
+CUR_DIR=os.path.realpath(os.curdir)
+
 # Set binary directory paths
-GGNFS_PATH = '../../bin/x64/Release/'
-MSIEVE_PATH = '../../../msieve/build.vc10/x64/Release/'
+GGNFS_PATH = '/usr/bin/'
+MSIEVE_PATH = '/usr/bin/'
 
 # Set the number of CPU cores and threads
 NUM_CORES = 4
@@ -69,7 +73,7 @@
 # number of linear algebra threads to launch
 LA_THREADS = NUM_CORES * THREADS_PER_CORE
 
-USE_CUDA = True
+USE_CUDA = False
 GPU_NUM = 0
 MSIEVE_POLY_TIME_LIMIT = 0
 
@@ -103,8 +107,8 @@
 
 # default parameter files
 
-DEFAULT_PAR_FILE = GGNFS_PATH + 'def-par.txt'
-DEFAULT_POLSEL_PAR_FILE = GGNFS_PATH + 'def-nm-params.txt'
+DEFAULT_PAR_FILE = '/usr/share/doc/ggnfs/def-par.txt'
+DEFAULT_POLSEL_PAR_FILE = '/usr/share/doc/ggnfs/def-nm-params.txt'
 
 # temporary files
 
@@ -258,7 +262,8 @@
 # write string to log(s):
 
 def write_string_to_log(s):
-  with open(LOGNAME, 'a') as out_f:
+  # XXX hax
+  with open(CUR_DIR+'/'+LOGNAME, 'a') as out_f:
     print(date_time_string() + s, file = out_f)
 
 def output(s, console = True, log = True):