diff --git a/configure b/configure
index ec57e92..e005fe9 100755
--- a/configure
+++ b/configure
@@ -1,6 +1,6 @@
 #! /bin/sh
 # Guess values for system-dependent variables and create Makefiles.
-# Generated by GNU Autoconf 2.59 for xpa 2.1.19.
+# Generated by GNU Autoconf 2.59 for xpa 2.1.20.
 #
 # Report bugs to <eric@cfa.harvard.edu>.
 #
@@ -269,8 +269,8 @@ SHELL=${CONFIG_SHELL-/bin/sh}
 # Identity of this package.
 PACKAGE_NAME='xpa'
 PACKAGE_TARNAME='xpa'
-PACKAGE_VERSION='2.1.19'
-PACKAGE_STRING='xpa 2.1.19'
+PACKAGE_VERSION='2.1.20'
+PACKAGE_STRING='xpa 2.1.20'
 PACKAGE_BUGREPORT='eric@cfa.harvard.edu'
 
 ac_unique_file="./xpa.h"
@@ -780,7 +780,7 @@ 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 xpa 2.1.19 to adapt to many kinds of systems.
+\`configure' configures xpa 2.1.20 to adapt to many kinds of systems.
 
 Usage: $0 [OPTION]... [VAR=VALUE]...
 
@@ -845,7 +845,7 @@ fi
 
 if test -n "$ac_init_help"; then
   case $ac_init_help in
-     short | recursive ) echo "Configuration of xpa 2.1.19:";;
+     short | recursive ) echo "Configuration of xpa 2.1.20:";;
    esac
   cat <<\_ACEOF
 
@@ -972,7 +972,7 @@ fi
 test -n "$ac_init_help" && exit 0
 if $ac_init_version; then
   cat <<\_ACEOF
-xpa configure 2.1.19
+xpa configure 2.1.20
 generated by GNU Autoconf 2.59
 
 Copyright (C) 2003 Free Software Foundation, Inc.
@@ -986,7 +986,7 @@ cat >&5 <<_ACEOF
 This file contains any messages produced by compilers while
 running configure, to aid debugging if configure makes a mistake.
 
-It was created by xpa $as_me 2.1.19, which was
+It was created by xpa $as_me 2.1.20, which was
 generated by GNU Autoconf 2.59.  Invocation command line was
 
   $ $0 $@
@@ -8278,7 +8278,7 @@ _ASBOX
 } >&5
 cat >&5 <<_CSEOF
 
-This file was extended by xpa $as_me 2.1.19, which was
+This file was extended by xpa $as_me 2.1.20, which was
 generated by GNU Autoconf 2.59.  Invocation command line was
 
   CONFIG_FILES    = $CONFIG_FILES
@@ -8338,7 +8338,7 @@ _ACEOF
 
 cat >>$CONFIG_STATUS <<_ACEOF
 ac_cs_version="\\
-xpa config.status 2.1.19
+xpa config.status 2.1.20
 configured by $0, generated by GNU Autoconf 2.59,
   with options \\"`echo "$ac_configure_args" | sed 's/[\\""\`\$]/\\\\&/g'`\\"
 
diff --git a/configure.ac b/configure.ac
index 5abb477..95d332e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,7 +1,7 @@
 #	This file is an input file used by the GNU "autoconf" program to
 #	generate the file "configure", which is run during XPA installation
 #	to configure the system for the local environment.
-AC_INIT(xpa, 2.1.19, eric@cfa.harvard.edu, xpa)
+AC_INIT(xpa, 2.1.20, eric@cfa.harvard.edu, xpa)
 
 AC_CONFIG_HEADERS([conf.h])
 AC_CONFIG_SRCDIR(./xpa.h)
diff --git a/xpa.h b/xpa.h
index 2011b16..6918f19 100644
--- a/xpa.h
+++ b/xpa.h
@@ -20,8 +20,8 @@
 
 #define XPA_MAJOR_VERSION 2
 #define XPA_MINOR_VERSION 1
-#define XPA_PATCH_LEVEL 19
-#define XPA_VERSION "2.1.19"
+#define XPA_PATCH_LEVEL 20
+#define XPA_VERSION "2.1.20"
 
 /* #define XPA_DEBUG 1 */
 #ifdef XPA_DEBUG