diff --git a/NEWS b/NEWS
index 4673ebe..5f8a6a9 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,11 @@
+0.57	2021-06-19
+
+	* Add macports installation instructions (thanks Haren).
+	* --timezone: Enabled for Darwin, FreeBSD, NetBSD and OpenBSD.
+	* --clocks: Add `CLOCK_BOOTTIME_ALARM`, `CLOCK_PROCESS_CPUTIME_ID`
+	  and `CLOCK_REALTIME_ALARM` to output.
+	* darwin: Enabled `--clocks`.
+
 0.56	2021-06-13
 
 	* tidy: compact and align structs for memory size and performance.
diff --git a/configure b/configure
index af061b1..c5c2cac 100755
--- a/configure
+++ b/configure
@@ -1,6 +1,6 @@
 #! /bin/sh
 # Guess values for system-dependent variables and create Makefiles.
-# Generated by GNU Autoconf 2.69 for procenv 0.56.
+# Generated by GNU Autoconf 2.69 for procenv 0.57.
 #
 # Report bugs to <jamesodhunt@gmail.com>.
 #
@@ -582,8 +582,8 @@ MAKEFLAGS=
 # Identity of this package.
 PACKAGE_NAME='procenv'
 PACKAGE_TARNAME='procenv'
-PACKAGE_VERSION='0.56'
-PACKAGE_STRING='procenv 0.56'
+PACKAGE_VERSION='0.57'
+PACKAGE_STRING='procenv 0.57'
 PACKAGE_BUGREPORT='jamesodhunt@gmail.com'
 PACKAGE_URL='https://github.com/jamesodhunt/procenv'
 
@@ -1336,7 +1336,7 @@ 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 procenv 0.56 to adapt to many kinds of systems.
+\`configure' configures procenv 0.57 to adapt to many kinds of systems.
 
 Usage: $0 [OPTION]... [VAR=VALUE]...
 
@@ -1408,7 +1408,7 @@ fi
 
 if test -n "$ac_init_help"; then
   case $ac_init_help in
-     short | recursive ) echo "Configuration of procenv 0.56:";;
+     short | recursive ) echo "Configuration of procenv 0.57:";;
    esac
   cat <<\_ACEOF
 
@@ -1525,7 +1525,7 @@ fi
 test -n "$ac_init_help" && exit $ac_status
 if $ac_init_version; then
   cat <<\_ACEOF
-procenv configure 0.56
+procenv configure 0.57
 generated by GNU Autoconf 2.69
 
 Copyright (C) 2012 Free Software Foundation, Inc.
@@ -1950,7 +1950,7 @@ 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 procenv $as_me 0.56, which was
+It was created by procenv $as_me 0.57, which was
 generated by GNU Autoconf 2.69.  Invocation command line was
 
   $ $0 $@
@@ -2335,7 +2335,7 @@ ac_configure="$SHELL $ac_aux_dir/configure"  # Please don't use this var.
 
 
 
-PROCENV_VERSION=0.56
+PROCENV_VERSION=0.57
 
 
 # Expand $ac_aux_dir to an absolute path.
@@ -6083,7 +6083,7 @@ fi
 
 # Define the identity of the package.
  PACKAGE='procenv'
- VERSION='0.56'
+ VERSION='0.57'
 
 
 cat >>confdefs.h <<_ACEOF
@@ -7167,7 +7167,7 @@ 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 procenv $as_me 0.56, which was
+This file was extended by procenv $as_me 0.57, which was
 generated by GNU Autoconf 2.69.  Invocation command line was
 
   CONFIG_FILES    = $CONFIG_FILES
@@ -7234,7 +7234,7 @@ _ACEOF
 cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
 ac_cs_config="`$as_echo "$ac_configure_args" | sed 's/^ //; s/[\\""\`\$]/\\\\&/g'`"
 ac_cs_version="\\
-procenv config.status 0.56
+procenv config.status 0.57
 configured by $0, generated by GNU Autoconf 2.69,
   with options \\"\$ac_cs_config\\"
 
diff --git a/configure.ac b/configure.ac
index d35df9e..9ce4c6f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,7 +1,7 @@
 #                                               -*- Autoconf -*-
 # Process this file with autoconf to produce a configure script.
 
-m4_define([procenv_version], [0.56])
+m4_define([procenv_version], [0.57])
 
 AC_INIT(procenv,[procenv_version],[jamesodhunt@gmail.com],,[https://github.com/jamesodhunt/procenv])
 
diff --git a/procenv.spec b/procenv.spec
index ab0746f..1140892 100644
--- a/procenv.spec
+++ b/procenv.spec
@@ -1,12 +1,12 @@
 Name:           procenv
-Version:        0.56
+Version:        0.57
 Release:        1%{?dist}
 Summary:        Utility to show process environment
 
 Group:          Applications/System
 License:        GPLv3+
 URL:            https://github.com/jamesodhunt/procenv
-Source0:        https://github.com/jamesodhunt/procenv/archive/0.56.tar.gz
+Source0:        https://github.com/jamesodhunt/procenv/archive/0.57.tar.gz
 BuildRoot:      %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
 
 # fixme: should be autoconf >= 2.68, but Fedora packages or alien'ed dpkg