diff --git a/configure.in b/configure.in
index b1669e6..54c3de7 100644
--- a/configure.in
+++ b/configure.in
@@ -52,7 +52,7 @@ while test $MINOR -gt 255; do
       MAJOR=$((MAJOR+1))
 done
 
-AC_MSG_NOTICE([Version number of $PACKAGENAME is: ${MAJOR}.${MINOR}.${LEAST}])
+AC_MSG_NOTICE([Version number of $PACKAGENAME is: ${MAJOR}.${MINOR}.${LEAST}$(<build-string)])
 AM_INIT_AUTOMAKE($PACKAGENAME, $MAJOR.$MINOR.$LEAST, [marc@waeckerlin.org])
 
 # author for signing packages
@@ -60,8 +60,6 @@ if test -z "$PACKAGERID"; then
    PACKAGERID="Marc Wäckerlin (http://marc.waeckerlin.org) <marc@waeckerlin.org>"
 fi
 AC_ARG_VAR(PACKAGERID, [Signature identification of the package author.])
-BUILDDATE=$(date --rfc-2822)
-AC_SUBST(BUILDDATE)
 
 # files to create
 AC_CONFIG_FILES([makefile ${PACKAGENAME}.spec src/version.cxx
@@ -98,6 +96,8 @@ README=README
 AC_SUBST_FILE(README)
 CHANGE_LOG=ChangeLog
 AC_SUBST_FILE(CHANGE_LOG)
+DISTRO=$(lsb_release -sc)
+AC_SUBST(DISTRO)
 
 AM_CPPFLAGS="-DPACKAGEVERSION='\"${VERSION}\"' -DPACKAGENAME='\"${PACKAGENAME}\"'"
 
@@ -127,7 +127,7 @@ AC_CHECK_HEADERS(unistd.h fcntl.h, [have_exec=yes])
 AC_CHECK_HEADER(dirent.h, [have_dir=yes])
 
 # solaris?
-AC_CHECK_HEADER(sys/old_procfs.h, [AM_CPPFLAGS=-D__solaris__])
+AC_CHECK_HEADER(sys/old_procfs.h, [AM_CPPFLAGS+="-D__solaris__"])
 
 # Arguments
 AM_MAINTAINER_MODE
@@ -253,9 +253,11 @@ AC_ARG_WITH([boost-thread],AS_HELP_STRING([--with-boost-thread],
              else
                chk_libs=""
              fi],
-             [chk_libs="boost_thread boost_thread-mt boost_thread-${CXX} boost_thread-${CC} boost_thread-${CXX}-mt boost_thread-${CC}-mt"])
-for ax_lib in $chk_libs; do
-  AC_CHECK_LIB($ax_lib, main, [BOOST_THREAD_LIB="-l$ax_lib" break])
+             [chk_libs=( "boost_thread boost_thread-mt boost_thread-${CXX} boost_thread-${CC} boost_thread-${CXX}-mt boost_thread-${CC}-mt" "boost_system" )])
+for (( i=0; i<${#chk_libs[*]}; ++i )); do rnd=${chk_libs[$i]}
+  for ax_lib in $rnd; do
+    AC_CHECK_LIB($ax_lib, main, [BOOST_THREAD_LIB="${BOOST_THREAD_LIB} -l$ax_lib" break])
+  done
 done
 AC_SUBST(BOOST_THREAD_LIB)
 AM_CONDITIONAL(HAVE_BOOST_THREAD, test -n "$BOOST_THREAD_LIB")
@@ -263,7 +265,7 @@ AC_ARG_ENABLE(pedantic,
   [AS_HELP_STRING([--enable-pedantic],
                   [enable all warnings and checks, abort on warnings])],
   [have_pedantic="$enableval"; test "$enableval" = "yes" &&  \
-     AM_CXXFLAGS="${AM_CXXFLAGS:-} -pedantic-errors -Wall -W -Wfloat-equal -Wundef -Wendif-labels -Wpointer-arith -Wcast-align -Wwrite-strings -Wconversion -Wsign-compare -Wmissing-format-attribute -Wno-multichar -Wpacked -Wredundant-decls -Werror -Wshadow -Wcast-qual -Wno-ctor-dtor-privacy"])
+     CXXFLAGS="${CXXFLAGS:-} -pedantic-errors -Wall -W -Wfloat-equal -Wundef -Wendif-labels -Wpointer-arith -Wcast-align -Wwrite-strings -Wconversion -Wsign-compare -Wmissing-format-attribute -Wno-multichar -Wpacked -Wredundant-decls -Werror -Wshadow -Wcast-qual -Wno-ctor-dtor-privacy"])
 dnl problem in libs: -Wshadow -Wcast-qual
 dnl auto.hxx: -Wno-ctor-dtor-privacy (removed)
 AM_CONDITIONAL(PEDANTIC, test "$enableval" = "yes")
@@ -291,6 +293,8 @@ AM_CONDITIONAL(MAC, test "$MAC" = "yes")
 # export macros
 RPMBUILD=${BUILD_NUMBER:-1}
 AC_SUBST(RPMBUILD)
+BUILD_NUMBER=${BUILD_NUMBER:-1}
+AC_SUBST(BUILD_NUMBER)
 SRCDIR=${srcdir}
 AC_SUBST(SRCDIR)
 AC_SUBST(SRC_DIR)
@@ -300,6 +304,7 @@ AC_SUBST(HAVE_DOT)
 AC_SUBST(HAVE_DOXYGEN)
 AC_SUBST(THREADS)
 AC_SUBST(PACKAGENAME)
+AC_SUBST(VERSION)
 AC_SUBST(AM_CXXFLAGS)
 AC_SUBST(AM_CPPFLAGS)
 AC_SUBST(LIBS)
diff --git a/debian/changelog.in b/debian/changelog.in
index 9487502..7f3519d 100644
--- a/debian/changelog.in
+++ b/debian/changelog.in
@@ -1,5 +1,5 @@
-@PACKAGE@ (@VERSION@-1) unstable; urgency=low
+@PACKAGE@ (@VERSION@-@BUILD_NUMBER@) @DISTRO@; urgency=low
 
-  * see https://dev.marc.waeckerlin.org/projects/mrw-c++++ for changes
+  * see https://dev.marc.waeckerlin.org/projects/mrw-c++ for changes
 
  -- @PACKAGERID@  @BUILDDATE@
diff --git a/debian/control.in b/debian/control.in
index 0c226e6..e35dfd1 100644
--- a/debian/control.in
+++ b/debian/control.in
@@ -1,10 +1,10 @@
 Source: mrw-c++
 Priority: extra
 Maintainer: Marc Wäckerlin (http://marc.waeckerlin.org) <marc@waeckerlin.org>
-Build-Depends: debhelper (>= 7), autotools-dev
+Build-Depends: debhelper (>= 7), autotools-dev, libiberty-dev, libboost-thread-dev
 Standards-Version: 3.8.1
 Section: libs
-Homepage: https://dev.marc.waeckerlin.org/projects/mrw-c++++
+Homepage: https://dev.marc.waeckerlin.org/projects/mrw-c++
 
 Package: mrw-c++-dev
 Section: libdevel
diff --git a/makefile.am b/makefile.am
index b2ca1b0..7a4014d 100644
--- a/makefile.am
+++ b/makefile.am
@@ -15,7 +15,7 @@ SUBDIRS = @SRC_DIR@ @TST_DIR@ @DOC_DIR@
 
 doc_DATA = AUTHORS COPYING ChangeLog NEWS README INSTALL
 
-EXTRA_DIST = bootstrap.sh debian
+EXTRA_DIST = bootstrap.sh debian build-string
 
 DISTCLEANFILES = debian/changelog
 
@@ -44,20 +44,26 @@ rpm: dist
 
 deps = ${top_srcdir}/COPYING ${top_srcdir}/README ${top_srcdir}/INSTALL ${top_srcdir}/NEWS ${top_srcdir}/ChangeLog
 
+build-string:
+	touch build-string
+
 clean-local:
 	- rm README.debian
 	- rm @PACKAGENAME@-dev_@MAJOR@.@MINOR@.@LEAST@-*.deb \
-	     @PACKAGENAME@_@MAJOR@.@MINOR@.@LEAST@-*.changes \
-	     @PACKAGENAME@_@MAJOR@.@MINOR@.@LEAST@-1.tar.gz \
-	     @PACKAGENAME@_@MAJOR@.@MINOR@.@LEAST@-1.dsc \
-	     @PACKAGENAME@-@MAJOR@.@MINOR@.@LEAST@.tar.gz \
-	     @PACKAGENAME@_@MAJOR@.@MINOR@.@LEAST@-*.deb
+	     @PACKAGENAME@_@MAJOR@.@MINOR@.@LEAST@*.changes \
+	     @PACKAGENAME@_@MAJOR@.@MINOR@.@LEAST@*.tar.gz \
+	     @PACKAGENAME@_@MAJOR@.@MINOR@.@LEAST@*.dsc \
+	     @PACKAGENAME@-@MAJOR@.@MINOR@.@LEAST@*.tar.gz \
+	     @PACKAGENAME@_@MAJOR@.@MINOR@.@LEAST@*.deb
 
 distclean-local:
-	- rm -r ${top_builddir}/@DOC_DIR@/html/* ${top_builddir}/@DOC_DIR@/latex/*
+	- rm -r ${top_builddir}/@DOC_DIR@/html/*
+	- rm -r ${top_builddir}/@DOC_DIR@/latex/*
 	- rm makefile makefile.in doxygen.err libmrw.doxytag
 	- find . -name '*~' | xargs rm
 	- rm -rf autom4te.cache SPECS RPMS BUILD BUILDROOT SRPMS
 	- rm aclocal.m4 config.guess config.sub configure \
 	     depcomp install-sh ltmain.sh makefile makefile.in \
 	     missing mkinstalldirs
+
+MAINTAINERCLEANFILES = debian/control build-string
diff --git a/src/mrw/checkcxx11.hxx b/src/mrw/checkcxx11.hxx
index c104a6a..3a9e9e6 100644
--- a/src/mrw/checkcxx11.hxx
+++ b/src/mrw/checkcxx11.hxx
@@ -71,29 +71,31 @@ namespace std {
 #      warning trying standard C++11 support
 #    endif
 #  elif __APPLE__
-     /// Code is compiled with an old non C++11 standard compliant compiler
-     /** There are workarounds for old non C++11 compatible
-         compilers. These workarounds are deprecated, but will remain
-         until most compilers fully support C++11. So this workaround
-         will be removed in future releases, when support for C++11 is
-         more common. Only rely on this workaround, if you really have
-         to. */
-#    define MRW__OLD_PRE11_COMPILER
-#    warning you need a C++11 compliant compiler, on gcc: add -std=c++11
-#    warning emulating C++11 - this changes the way you use the library
-#    warning this is deprecated and will be removed in future releases
-#    warning refere to the library documentation for more details
-#    warning special workaround for apple
-#    include <tr1/memory>
-     namespace std {
-       // there is no std::shared_ptr in apple, but
-       // std::tr1::shared_ptr in <tr1/memory>
-       template <typename T> class shared_ptr: public tr1::shared_ptr<T> {
-         public:
-           explicit shared_ptr(): tr1::shared_ptr<T>() {}
-           explicit shared_ptr(T* p): tr1::shared_ptr<T>(p) {}
-       };
-     }
+#    if MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_9
+       /// Code is compiled with an old non C++11 standard compliant compiler
+       /** There are workarounds for old non C++11 compatible
+           compilers. These workarounds are deprecated, but will
+           remain until most compilers fully support C++11. So this
+           workaround will be removed in future releases, when support
+           for C++11 is more common. Only rely on this workaround, if
+           you really have to. */
+#      define MRW__OLD_PRE11_COMPILER
+#      warning you need a C++11 compliant compiler, on gcc: add -std=c++11
+#      warning emulating C++11 - this changes the way you use the library
+#      warning this is deprecated and will be removed in future releases
+#      warning refere to the library documentation for more details
+#      warning special workaround for apple
+#      include <tr1/memory>
+       namespace std {
+         // there is no std::shared_ptr in apple, but
+         // std::tr1::shared_ptr in <tr1/memory>
+         template <typename T> class shared_ptr: public tr1::shared_ptr<T> {
+           public:
+             explicit shared_ptr(): tr1::shared_ptr<T>() {}
+             explicit shared_ptr(T* p): tr1::shared_ptr<T>(p) {}
+         };
+       }
+#    endif
 #  endif
 
 #endif