diff --git a/AUTHORS b/AUTHORS
index 91055e582..6a70c6080 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -20,6 +20,7 @@ The following submitted code, packages or analysis, and deserve special thanks:
   Steven de Brouwer
   Pietro Cerutti
   Alexander Neumann
+  Emil Sköldberg
 
 Thanks to the following, who submitted detailed bug reports and excellent suggestions:
   Eugene Kramer
diff --git a/ChangeLog b/ChangeLog
index e7831a143..109125ae3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -6,6 +6,7 @@
    message when called without an ID.
  + Summary report bar colors can now be specified with color.summary.bar
    and color.summary.background configuration variables.
+ + The configure script is more portable (thanks to Emil Sköldberg).
 
 ------ old releases ------------------------------
 
diff --git a/configure.ac b/configure.ac
index 818962e5c..94ae68e6c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -80,7 +80,7 @@ AC_ARG_WITH([ncurses-lib],
             [ncurses_lib=$withval],
             [ncurses_lib=''])
 
-if test "x$with_ncurses" == "xyes" ; then
+if test "x$with_ncurses" = "xyes" ; then
   AC_DEFINE([HAVE_LIBNCURSES], [1], [Defined if you have libncurses])
   if test -n "$ncurses_inc"; then
     CFLAGS="$CFLAGS -I$ncurses_inc"
@@ -111,7 +111,7 @@ fi
 #            [readline_lib=$withval],
 #            [readline_lib=''])
 #
-#if test "x$with_readline" == "xyes" ; then
+#if test "x$with_readline" = "xyes" ; then
 #  AC_DEFINE([HAVE_LIBREADLINE], [1], [Defined if you have libreadline])
 #  if test -n "$readline_inc"; then
 #    CFLAGS="$CFLAGS -I$readline_inc"
@@ -142,7 +142,7 @@ AC_ARG_WITH([lua-lib],
             [lua_lib=$withval],
             [lua_lib=''])
 
-if test "x$with_lua" == "xyes" ; then
+if test "x$with_lua" = "xyes" ; then
   AC_DEFINE([HAVE_LIBLUA], [1], [Defined if you have liblua])
   if test -n "$lua_inc"; then
     CFLAGS="$CFLAGS -I$lua_inc"