diff --git a/Makefile.am b/Makefile.am
index 581158cf..c83c6084 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -7,6 +7,6 @@ dist-hook:
 	if [ -f ../GLPlugin/lib/Monitoring/GLPlugin.pm ]; then cp -r ../GLPlugin/lib .; fi
 	rm -f t/var/tmp/*
 	rm -f t/var/adm/*
-	find $(distdir) -type f -exec $(DOS2UNIX) {} \;
+	find $(distdir) -type f -exec $(DOS2UNIX) {} >/dev/null 2>&1 \;
 	make
 
diff --git a/configure.ac b/configure.ac
index 71a79abf..138abb15 100644
--- a/configure.ac
+++ b/configure.ac
@@ -38,57 +38,6 @@ AC_SUBST(with_nagios_user)
 AC_SUBST(with_nagios_group)
 INSTALL_OPTS="-o $with_nagios_user -g $with_nagios_group"
 AC_SUBST(INSTALL_OPTS)
-AC_ARG_WITH(noinst_level,
-  ACX_HELP_STRING([--with-noinst-level=LEVEL],
-    [error level if nwc_health is not installed]),
-  with_noinst_level=$withval,
-  with_noinst_level=unknown)
-AC_SUBST(NOINSTLEVEL, $with_noinst_level)
-AC_ARG_WITH(degrees,
-  ACX_HELP_STRING([--with-degrees=UNIT],
-    [which temperature unit to use. (celsius or fahrenheit)]),
-  with_degrees=$withval,
-  with_degrees=unknown)
-case "$with_degrees" in
-  fahrenheit)
-    AC_SUBST(CELSIUS, 0)
-    ;;
-  *)
-    AC_SUBST(CELSIUS, 1)
-    ;;
-esac
-AC_ARG_ENABLE([perfdata],
-[  --enable-perfdata       wether to output perfdata (default=no)], ,enable_perfdata=no)
-if test x"$enable_perfdata" = xyes ; then
-  AC_SUBST(PERFDATA, 1)
-else
-  AC_SUBST(PERFDATA, 0)
-fi
-AC_ARG_ENABLE([extendedinfo],
-[  --enable-extendedinfo   wether to output extended info (default=no)], ,enable_extendedinfo=no)
-if test x"$enable_extendedinfo" = xyes ; then
-  AC_SUBST(EXTENDEDINFO, 1)
-else
-  AC_SUBST(EXTENDEDINFO, 0)
-fi
-AC_ARG_ENABLE([hwinfo],
-[  --disable-hwinfo        wether to output model desc., serial no., bios version (default=yes)], ,enable_hwinfo=yes)
-
-if test x"$enable_hwinfo" = xyes ; then
-  AC_SUBST(HWINFO, 1)
-else
-  AC_SUBST(HWINFO, 0)
-fi
-
-
-case "$host_os" in 
-  *hp*)
-    defaulttrustedpath=/bin:/sbin:/usr/bin:/usr/sbin:/usr/contrib/bin
-    ;;
-  *)
-    defaulttrustedpath=/bin:/sbin:/usr/bin:/usr/sbin
-    ;;
-esac
 
 EXTRAS=
 dnl PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/etc:/usr/local/bin:/usr/local/sbin:$PATH
@@ -116,9 +65,4 @@ AC_OUTPUT(Makefile plugins-scripts/Makefile plugins-scripts/subst)
 ACX_FEATURE([with],[perl])
 ACX_FEATURE([with],[nagios-user])
 ACX_FEATURE([with],[nagios-group])
-ACX_FEATURE([with],[noinst-level])
-ACX_FEATURE([with],[degrees])
-ACX_FEATURE([enable],[perfdata])
-ACX_FEATURE([enable],[extendedinfo])
-ACX_FEATURE([enable],[hwinfo])
 ACX_FEATURE([disable],[standalone], $disable_standalone)
diff --git a/check_nwc_health.php b/contrib/check_nwc_health.php
similarity index 100%
rename from check_nwc_health.php
rename to contrib/check_nwc_health.php
diff --git a/lib/Monitoring/GLPlugin.pm b/lib/Monitoring/GLPlugin.pm
index 2b862549..c3bcd802 100755
--- a/lib/Monitoring/GLPlugin.pm
+++ b/lib/Monitoring/GLPlugin.pm
@@ -1,11 +1,13 @@
 package Monitoring::GLPlugin;
+# ABSTRACT: helper functions to build a upnp-based monitoring plugin
+
 use strict;
 use IO::File;
 use File::Basename;
 use Digest::MD5 qw(md5_hex);
 use Errno;
-#use AutoLoader;
 our $AUTOLOAD;
+our $VERSION = "1.0";
 
 use constant { OK => 0, WARNING => 1, CRITICAL => 2, UNKNOWN => 3 };
 
@@ -1011,9 +1013,12 @@ sub valdiff {
     }
     if ($mode eq "normal" || $mode eq "lookback" || $mode eq "lookback_freeze_chill") {
       if ($self->{$_} =~ /^\d+$/) {
-        if ($self->opts->lookback) {
-          $last_values->{$_} = 0 if ! exists $last_values->{$_};
-          if ($self->{$_} >= $last_values->{$_}) {
+        $last_values->{$_} = 0 if ! exists $last_values->{$_};
+        if ($self->{$_} >= $last_values->{$_}) {
+          $self->{'delta_'.$_} = $self->{$_} - $last_values->{$_};
+        } else {
+          if ($mode =~ /lookback_freeze/) {
+            # hier koennen delta-werte auch negativ sein, wenn z.b. peers verschwinden
             $self->{'delta_'.$_} = $self->{$_} - $last_values->{$_};
           } else {
             # vermutlich db restart und zaehler alle auf null
diff --git a/lib/Monitoring/GLPlugin/SNMP.pm b/lib/Monitoring/GLPlugin/SNMP.pm
index 7fe08842..dd9c101f 100644
--- a/lib/Monitoring/GLPlugin/SNMP.pm
+++ b/lib/Monitoring/GLPlugin/SNMP.pm
@@ -1,5 +1,6 @@
 package Monitoring::GLPlugin::SNMP;
 our @ISA = qw(Monitoring::GLPlugin);
+# ABSTRACT: helper functions to build a snmp-based monitoring plugin
 
 use strict;
 use File::Basename;
@@ -7,6 +8,7 @@ use Digest::MD5 qw(md5_hex);
 use Data::Dumper;
 use AutoLoader;
 our $AUTOLOAD;
+our $VERSION = "1.0";
 
 use constant { OK => 0, WARNING => 1, CRITICAL => 2, UNKNOWN => 3 };
 
@@ -146,6 +148,13 @@ sub add_snmp_args {
       required => 0,
       env => 'SNMPWALK',
   );
+  $self->add_arg(
+      spec => 'servertype=s',
+      help => '--servertype
+     The type of the network device: cisco (default). Use it if auto-detection
+     is not possible',
+      required => 0,
+  );
   $self->add_arg(
       spec => 'oids=s',
       help => '--oids
diff --git a/lib/Monitoring/GLPlugin/UPNP.pm b/lib/Monitoring/GLPlugin/UPNP.pm
index 727a748f..3b6ad931 100644
--- a/lib/Monitoring/GLPlugin/UPNP.pm
+++ b/lib/Monitoring/GLPlugin/UPNP.pm
@@ -1,11 +1,13 @@
 package Monitoring::GLPlugin::UPNP;
 our @ISA = qw(Monitoring::GLPlugin);
+# ABSTRACT: helper functions to build a upnp-based monitoring plugin
 
 use strict;
 use File::Basename;
 use Digest::MD5 qw(md5_hex);
 use AutoLoader;
 our $AUTOLOAD;
+our $VERSION = "1.0";
 
 use constant { OK => 0, WARNING => 1, CRITICAL => 2, UNKNOWN => 3 };
 
diff --git a/plugins-scripts/Makefile.am b/plugins-scripts/Makefile.am
index c7b3dcdf..e412d6fc 100644
--- a/plugins-scripts/Makefile.am
+++ b/plugins-scripts/Makefile.am
@@ -1,19 +1,3 @@
-## Process this file with automake to produce Makefile.in
-
-SED=/bin/sed
-GREP=/bin/grep
-CAT=/bin/cat
-ECHO=/bin/echo
-if DISABLE_STANDALONE
-STANDALONE = no
-else
-STANDALONE = yes
-endif
-
-SUFFIXES = .pl .pm .sh
-
-VPATH=$(top_srcdir) $(top_srcdir)/plugins-scripts $(top_srcdir)/plugins-scripts/t
-
 libexec_SCRIPTS=check_nwc_health
 GL_MODULES=\
   ../lib/Monitoring/GLPlugin.pm \
@@ -206,7 +190,22 @@ EXTRA_MODULES=\
   Classes/Lantronix/SLS.pm \
   Classes/MibsAndOids.pm \
   Classes/Device.pm
-EXTRA_DIST=check_nwc_health.pl $(EXTRA_MODULES) $(GL_MODULES)
+
+SED=/bin/sed
+GREP=/bin/grep
+CAT=/bin/cat
+ECHO=/bin/echo
+if DISABLE_STANDALONE
+STANDALONE = no
+else
+STANDALONE = yes
+endif
+
+SUFFIXES = .pl .pm .sh
+
+VPATH=$(top_srcdir) $(top_srcdir)/plugins-scripts $(top_srcdir)/plugins-scripts/t
+
+EXTRA_DIST=$(libexec_SCRIPTS).pl $(EXTRA_MODULES) $(GL_MODULES)
 
 CLEANFILES=$(libexec_SCRIPTS)
 
@@ -225,6 +224,7 @@ AM_INSTALL_PROGRAM_FLAGS=@INSTALL_OPTS@
 	chmod +x $@
 
 $(libexec_SCRIPTS) : $(EXTRA_DIST)
+	if [ -f ../../GLPlugin/lib/Monitoring/GLPlugin.pm ]; then cp -r ../../GLPlugin/lib ..; fi
 	$(ECHO) "#! #PERL# -w" | $(AWK) -f ./subst > $@
 	$(ECHO) "# nagios: -epn" >> $@
 	$(ECHO) >> $@
@@ -235,7 +235,7 @@ $(libexec_SCRIPTS) : $(EXTRA_DIST)
 		done \
 	fi
 	for m in ${EXTRA_MODULES}; do \
-		$(SED) -e 's/^1;//g' < $$m | $(SED) -e '/^__END__/,$$d' | $(AWK) -f ./subst | $(GREP) -v "use Nagios::Plugin" >> $@; \
+		$(SED) -e 's/^1;//g' < $$m | $(SED) -e '/^__END__/,$$d' | $(AWK) -f ./subst >> $@; \
 	done
 	$(ECHO) "package main;" >> $@
 	$(CAT) $(libexec_SCRIPTS).pl | $(AWK) -f ./subst >> $@
diff --git a/plugins-scripts/check_nwc_health.pl b/plugins-scripts/check_nwc_health.pl
index 87a6ad95..e8e290e0 100644
--- a/plugins-scripts/check_nwc_health.pl
+++ b/plugins-scripts/check_nwc_health.pl
@@ -3,7 +3,6 @@
 use strict;
 no warnings qw(once);
 
-
 eval {
   if ( ! grep /AUTOLOAD/, keys %Monitoring::GLPlugin::) {
     require "Monitoring::GLPlugin";
@@ -414,13 +413,6 @@
    The role of this device in a hsrp group (active/standby/listen)",
     required => 0,
 );
-$plugin->add_arg(
-    spec => 'servertype=s',
-    help => '--servertype
-   The type of the network device: cisco (default). Use it if auto-detection
-   is not possible',
-    required => 0,
-);
 
 $plugin->getopts();
 $plugin->classify();
@@ -444,7 +436,5 @@
     $plugin->check_messages(join => ', ', join_all => ', ');
 $message .= sprintf "\n%s\n", $plugin->get_info("\n")
     if $plugin->opts->verbose >= 1;
-#printf "%s\n", Data::Dumper::Dumper($plugin);
 
 $plugin->nagios_exit($code, $message);
-printf "schluss\n";