diff --git a/Makefile b/Makefile
index e6dd21d..fdec7d2 100644
--- a/Makefile
+++ b/Makefile
@@ -1,21 +1,18 @@
 DESTDIR = target
 
-PYCDIR = $(DESTDIR)/usr/lib/python3.1/site-packages
+PYDIR = $(DESTDIR)/usr/lib/python3.1/site-packages
 CTFDIR = $(DESTDIR)/usr/lib/ctf
 WWWDIR = $(DESTDIR)/usr/lib/www
 
 FAKE = fakeroot -s fake -i fake
 INSTALL = $(FAKE) install
 
-PYC  = __init__.pyc
-PYC += config.pyc points.pyc teams.pyc
-PYC += register.pyc scoreboard.pyc puzzler.pyc
-PYC += flagd.pyc pointsd.pyc pointscli.pyc
-PYC += histogram.pyc irc.pyc
-
 all: ctf.tce
 
-target: $(PYC)
+push: ctf.tce
+	netcat -l -q 0 -p 3333 < ctf.tce
+
+target: 
 	$(INSTALL) -d --mode=0755 --owner=100 $(DESTDIR)/var/lib/ctf
 
 	$(INSTALL) -d --mode=0755 --owner=100 $(DESTDIR)/var/lib/ctf/survey
@@ -23,8 +20,8 @@ target: $(PYC)
 	$(INSTALL) -d $(DESTDIR)/var/lib/ctf/disabled
 	touch $(DESTDIR)/var/lib/ctf/disabled/survey
 
-	$(INSTALL) -d $(PYCDIR)/ctf
-	$(INSTALL) $(PYC) $(PYCDIR)/ctf
+	$(INSTALL) -d $(PYDIR)/ctf
+	$(INSTALL) ctf/*.py $(PYDIR)/ctf
 
 	$(INSTALL) -d $(DESTDIR)/usr/lib/python2.6/site-packages/ctf
 	$(INSTALL) ctf/__init__.py $(DESTDIR)/usr/lib/python2.6/site-packages/ctf
@@ -55,7 +52,7 @@ ctf.tce: target
 
 clean:
 	rm -rf target
-	rm -f fake ctf.tce $(PYC)
+	rm -f fake ctf.tce 
 
 ctf/%.pyc: ctf/%.py
 	python3 -c 'from ctf import $(notdir $*)'
diff --git a/ctf/histogram.py b/ctf/histogram.py
index 3c7426c..8afe39a 100755
--- a/ctf/histogram.py
+++ b/ctf/histogram.py
@@ -1,5 +1,6 @@
 #! /usr/bin/env python3
 
+import fcntl
 import time
 import os
 import tempfile
@@ -64,8 +65,18 @@ plot %(plot)s\n''' % {'plot': ','.join(plotparts),
                       'pngout': pngout})
     instructions.flush()
 
-    gp = os.system('gnuplot %s 2>/dev/null </dev/null' % instructions.name)
-    os.rename("%s,tmp" % pngout, pngout)
+    lock = open('%s,lock' % pngout, 'a')
+    try:
+        fcntl.flock(lock, fcntl.LOCK_EX | fcntl.LOCK_NB)
+    except:
+        return
+
+    try:
+        gp = os.system('gnuplot %s 2>/dev/null </dev/null' % instructions.name)
+        os.rename("%s,tmp" % pngout, pngout)
+    finally:
+        fcntl.flock(lock, fcntl.LOCK_UN)
+
 
 if __name__ == '__main__':
     main()
diff --git a/ctf/puzzler.py b/ctf/puzzler.py
index 5022cc1..8700ef5 100755
--- a/ctf/puzzler.py
+++ b/ctf/puzzler.py
@@ -157,7 +157,7 @@ def main():
         # Show available puzzles in category
         show_puzzles(cat, cat_dir)
     else:
-        thekeys = get_key(cat, points)
+        thekey = get_key(cat, points)
         if not teams.chkpasswd(team, passwd):
             start_html('Wrong password')
             end_html()
diff --git a/mkpuzzles.py b/mkpuzzles.py
index ab51030..d9079e5 100755
--- a/mkpuzzles.py
+++ b/mkpuzzles.py
@@ -3,7 +3,7 @@
 import os
 import shutil
 import optparse
-import config
+from ctf import config
 
 p = optparse.OptionParser()
 p.add_option('-p', '--puzzles', dest='puzzles', default='puzzles',
@@ -83,7 +83,11 @@ for cat in os.listdir(opts.puzzles):
         if files:
             f.write('<ul>\n')
             for fn, path in files:
-                shutil.copy(path, outdir)
+                if os.path.isdir(path):
+                    shutil.copytree(path, os.path.join(outdir, fn))
+                else:
+                    shutil.copy(path, outdir)
+
                 if not fn.startswith(','):
                     f.write('<li><a href="%s">%s</a></li>\n' % (fn, fn))
             f.write('</ul>\n')