diff --git a/BUGS b/BUGS
index 2234a05..68ef302 100644
--- a/BUGS
+++ b/BUGS
@@ -1,3 +1,5 @@
-BUGME May 2010
+BUGME November 2010
+
+Fails on mac osx : needs unnamed semaphores converted to named to work. Last
+working version 0.530.
 
-Nil known.
diff --git a/ChangeLog b/ChangeLog
index dddf06d..a2572c6 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,4 +1,11 @@
 lrzip ChangeLog
+NOVEMBER 2010, version 0.543 Con Kolivas
+* Fix for when there are multiple stream 0 entries per chunk, which would
+cause a failure on decompression.
+* Fix lzma windows being set far too small by mistake at all times.
+* Decrease nice level of main process compared to back end threads as it tends
+to be the rate limiting step.
+
 NOVEMBER 2010, version 0.542 Con Kolivas
 * Choose sane defaults for memory usage since linux ludicriously overcommits.
 * Use sliding mmap for any compression windows greater than 2/3 ram.
diff --git a/TODO b/TODO
index a45cd75..aaf9e69 100644
--- a/TODO
+++ b/TODO
@@ -24,3 +24,6 @@ Make stdin on decompression work without a temporary file.
 Make testing file integrity work without a temporary file.
 
 Fix darwin build since it doesn't support unnamed semamphores.
+
+Parallelise compression further by moving into next stream while backend
+threads still continue on earlier stream.
diff --git a/WHATS-NEW b/WHATS-NEW
index 8603a11..e55b761 100644
--- a/WHATS-NEW
+++ b/WHATS-NEW
@@ -1,3 +1,12 @@
+lrzip-0.543
+
+A fix for when large files being decompressed fail with multithreaded
+decompression.
+Slight speedup on multithreaded workloads by decreasing the nice value of the
+main process compared to the back end threads as it tends to be the rate
+limiting component.
+Fixed lzma compression windows being set way too small by default.
+
 lrzip-0.542
 
 Lrzip will now try to select sane defaults for memory usage in cases where the
diff --git a/configure b/configure
index 224fa25..4a419c6 100755
--- a/configure
+++ b/configure
@@ -1,6 +1,6 @@
 #! /bin/sh
 # Guess values for system-dependent variables and create Makefiles.
-# Generated by GNU Autoconf 2.67 for lrzip 0.542.
+# Generated by GNU Autoconf 2.67 for lrzip 0.543.
 #
 # Report bugs to <kernel@kolivas.org>.
 #
@@ -551,9 +551,9 @@ MAKEFLAGS=
 
 # Identity of this package.
 PACKAGE_NAME='lrzip'
-PACKAGE_TARNAME='lrzip-0.542'
-PACKAGE_VERSION='0.542'
-PACKAGE_STRING='lrzip 0.542'
+PACKAGE_TARNAME='lrzip-0.543'
+PACKAGE_VERSION='0.543'
+PACKAGE_STRING='lrzip 0.543'
 PACKAGE_BUGREPORT='kernel@kolivas.org'
 PACKAGE_URL=''
 
@@ -1221,7 +1221,7 @@ if test "$ac_init_help" = "long"; then
   # Omit some internal or obsolete options to make the list less imposing.
   # This message is too long to be a string in the A/UX 3.1 sh.
   cat <<_ACEOF
-\`configure' configures lrzip 0.542 to adapt to many kinds of systems.
+\`configure' configures lrzip 0.543 to adapt to many kinds of systems.
 
 Usage: $0 [OPTION]... [VAR=VALUE]...
 
@@ -1269,7 +1269,7 @@ Fine tuning of the installation directories:
   --infodir=DIR           info documentation [DATAROOTDIR/info]
   --localedir=DIR         locale-dependent data [DATAROOTDIR/locale]
   --mandir=DIR            man documentation [DATAROOTDIR/man]
-  --docdir=DIR            documentation root [DATAROOTDIR/doc/lrzip-0.542]
+  --docdir=DIR            documentation root [DATAROOTDIR/doc/lrzip-0.543]
   --htmldir=DIR           html documentation [DOCDIR]
   --dvidir=DIR            dvi documentation [DOCDIR]
   --pdfdir=DIR            pdf documentation [DOCDIR]
@@ -1286,7 +1286,7 @@ fi
 
 if test -n "$ac_init_help"; then
   case $ac_init_help in
-     short | recursive ) echo "Configuration of lrzip 0.542:";;
+     short | recursive ) echo "Configuration of lrzip 0.543:";;
    esac
   cat <<\_ACEOF
 
@@ -1375,7 +1375,7 @@ fi
 test -n "$ac_init_help" && exit $ac_status
 if $ac_init_version; then
   cat <<\_ACEOF
-lrzip configure 0.542
+lrzip configure 0.543
 generated by GNU Autoconf 2.67
 
 Copyright (C) 2010 Free Software Foundation, Inc.
@@ -2014,7 +2014,7 @@ cat >config.log <<_ACEOF
 This file contains any messages produced by compilers while
 running configure, to aid debugging if configure makes a mistake.
 
-It was created by lrzip $as_me 0.542, which was
+It was created by lrzip $as_me 0.543, which was
 generated by GNU Autoconf 2.67.  Invocation command line was
 
   $ $0 $@
@@ -5324,7 +5324,7 @@ cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
 # report actual input values of CONFIG_FILES etc. instead of their
 # values after options handling.
 ac_log="
-This file was extended by lrzip $as_me 0.542, which was
+This file was extended by lrzip $as_me 0.543, which was
 generated by GNU Autoconf 2.67.  Invocation command line was
 
   CONFIG_FILES    = $CONFIG_FILES
@@ -5386,7 +5386,7 @@ _ACEOF
 cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
 ac_cs_config="`$as_echo "$ac_configure_args" | sed 's/^ //; s/[\\""\`\$]/\\\\&/g'`"
 ac_cs_version="\\
-lrzip config.status 0.542
+lrzip config.status 0.543
 configured by $0, generated by GNU Autoconf 2.67,
   with options \\"\$ac_cs_config\\"
 
diff --git a/configure.ac b/configure.ac
index 774ee8d..ad66ab8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,5 +1,5 @@
 dnl Process this file with autoconf to produce a configure script.
-AC_INIT([lrzip],[0.542],[kernel@kolivas.org],[lrzip-0.542])
+AC_INIT([lrzip],[0.543],[kernel@kolivas.org],[lrzip-0.543])
 AC_CONFIG_HEADER(config.h)
 # see what our system is!
 AC_CANONICAL_HOST
diff --git a/rzip.h b/rzip.h
index 4f4448a..8d3aab0 100644
--- a/rzip.h
+++ b/rzip.h
@@ -19,7 +19,7 @@
 
 #define LRZIP_MAJOR_VERSION 0
 #define LRZIP_MINOR_VERSION 5
-#define LRZIP_MINOR_SUBVERSION 42
+#define LRZIP_MINOR_SUBVERSION 43
 
 #define NUM_STREAMS 2
 
diff --git a/stream.c b/stream.c
index c3635af..cf6fe17 100644
--- a/stream.c
+++ b/stream.c
@@ -645,7 +645,6 @@ static int seekto(struct stream_info *sinfo, i64 pos)
 }
 
 static pthread_t *threads;
-extern const i64 two_gig;
 
 /* open a set of output streams, compressing with the given
    compression level and algorithm */