diff --git a/Makefile-minix.in b/Makefile-minix.in
deleted file mode 100644
index 62f14da..0000000
--- a/Makefile-minix.in
+++ /dev/null
@@ -1,44 +0,0 @@
-##  $Revision: 1390 $
-##
-##  Unix makefile for editline library.
-##
-
-
-##  Set your options:
-##	-DANSI_ARROWS		ANSI arrows keys work like emacs.
-##	-DHAVE_STDLIB		Have <stdlib.h>.
-##	-DHAVE_TCGETATTR	Have , .
-##	-DHAVE_TERMIO		Have "struct termio" and <termio.h>
-##	(If neither of above two, we use <sgttyb.h> and BSD ioctl's)
-##	-DHIDE			Make static functions static (non debug).
-##	-DHIST_SIZE=n		History size.
-##	-DNEED_STRDUP		Don't have .
-##	-DUNIQUE_HISTORY	Don't save command if same as last one.
-##	-DUSE_DIRENT		Use <dirent.h>, not <sys/dir.h>?
-##	-DUSE_TERMCAP		Use the termcap library for terminal size
-##				see LDFLAGS, below, if you set this.
-##	-DNEED_PERROR		Don't have  (used in testit)
-DEFS="-DANSI_ARROWS -DHAVE_STDLIB -DHAVE_TCGETATTR -DHIDE -DUSE_DIRENT \
-	-DHIST_SIZE=100 -DUSE_TERMCAP -DSYS_UNIX"
-#-DNEED_STRDUP
-
-CFLAGS="-O -D_MINIX -D_POSIX_SOURCE $DEFS -wo"
-#CC1	= $(CC) $(CFLAGS) -c
-
-##  If you have -DUSE_TERMCAP, set this as appropriate:
-#LDFLAGS = -ltermlib
-#LDFLAGS = -ltermcap
-
-##  End of configuration.
-
-#SOURCES	= editline.c complete.c sysunix.c
-#LIBRARY = ../libedit.a
-LIBRARIES=libedit
-#OBJECTS	= editline.o complete.o sysunix.o
-libedit_FILES="editline.c complete.c sysunix.c"
-#SHARFILES =	README Makefile editline.3 editline.h unix.h editline.c \
-
-TYPE=both
-#include ../Makefile.inc
-
-#$(call ADDDEPENDENCIES,$(libedit_OBJECTS),editline.h)
diff --git a/TODO b/TODO
index 66f1a64..d8f5d39 100644
--- a/TODO
+++ b/TODO
@@ -1,8 +1,6 @@
 TODO
 
 * Port "fileman" example from BSD editline
-* Add --enable-FEATURE for remaining features defined in Makefile-minix.in
-* Check for tgetent to find termcap, e.g., http://www.tex.ac.uk/tex-archive/macros/texinfo/texinfo/configure.ac
 * Add support for rl_bind_key(), currently one needs to "hack" the Map[]
 * Add support for inhibiting completion: rl_inhibit_completion
 
diff --git a/config.h.in b/config.h.in
index 8172766..5e4085b 100644
--- a/config.h.in
+++ b/config.h.in
@@ -18,6 +18,9 @@
 /* Define to enable SIGSTOP (Ctrl-Z) key. */
 #undef CONFIG_SIGSTOP
 
+/* Don't save command if same as last one. */
+#undef CONFIG_UNIQUE_HISTORY
+
 /* Define to use the termcap library for terminal size. */
 #undef CONFIG_USE_TERMCAP
 
diff --git a/configure b/configure
index 8981921..6910daf 100755
--- a/configure
+++ b/configure
@@ -875,6 +875,7 @@ enable_sigstop
 enable_terminal_bell
 enable_termcap
 enable_history
+enable_unique_history
 '
       ac_precious_vars='build_alias
 host_alias
@@ -1519,6 +1520,7 @@ Optional Features:
   --enable-terminal-bell         Enable terminal bell on completion.
   --enable-termcap               Use the termcap library for terminal size.
   --enable-history=LINES         Enable scrollback history, default off.
+  --enable-unique-history        Uniqify scrollback history, i.e., don't save dupes.
 
 Optional Packages:
   --with-PACKAGE[=ARG]    use PACKAGE [ARG=yes]
@@ -4560,13 +4562,13 @@ if test "${lt_cv_nm_interface+set}" = set; then :
 else
   lt_cv_nm_interface="BSD nm"
   echo "int some_variable = 0;" > conftest.$ac_ext
-  (eval echo "\"\$as_me:4563: $ac_compile\"" >&5)
+  (eval echo "\"\$as_me:4565: $ac_compile\"" >&5)
   (eval "$ac_compile" 2>conftest.err)
   cat conftest.err >&5
-  (eval echo "\"\$as_me:4566: $NM \\\"conftest.$ac_objext\\\"\"" >&5)
+  (eval echo "\"\$as_me:4568: $NM \\\"conftest.$ac_objext\\\"\"" >&5)
   (eval "$NM \"conftest.$ac_objext\"" 2>conftest.err > conftest.out)
   cat conftest.err >&5
-  (eval echo "\"\$as_me:4569: output\"" >&5)
+  (eval echo "\"\$as_me:4571: output\"" >&5)
   cat conftest.out >&5
   if $GREP 'External.*some_variable' conftest.out > /dev/null; then
     lt_cv_nm_interface="MS dumpbin"
@@ -5772,7 +5774,7 @@ ia64-*-hpux*)
   ;;
 *-*-irix6*)
   # Find out which ABI we are using.
-  echo '#line 5775 "configure"' > conftest.$ac_ext
+  echo '#line 5777 "configure"' > conftest.$ac_ext
   if { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_compile\""; } >&5
   (eval $ac_compile) 2>&5
   ac_status=$?
@@ -7302,11 +7304,11 @@ else
    -e 's:.*FLAGS}\{0,1\} :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:7305: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:7307: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>conftest.err)
    ac_status=$?
    cat conftest.err >&5
-   echo "$as_me:7309: \$? = $ac_status" >&5
+   echo "$as_me:7311: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s "$ac_outfile"; then
      # The compiler can only warn and ignore the option if not recognized
      # So say no if there are warnings other than the usual output.
@@ -7641,11 +7643,11 @@ else
    -e 's:.*FLAGS}\{0,1\} :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:7644: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:7646: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>conftest.err)
    ac_status=$?
    cat conftest.err >&5
-   echo "$as_me:7648: \$? = $ac_status" >&5
+   echo "$as_me:7650: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s "$ac_outfile"; then
      # The compiler can only warn and ignore the option if not recognized
      # So say no if there are warnings other than the usual output.
@@ -7746,11 +7748,11 @@ else
    -e 's:.*FLAGS}\{0,1\} :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:7749: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:7751: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>out/conftest.err)
    ac_status=$?
    cat out/conftest.err >&5
-   echo "$as_me:7753: \$? = $ac_status" >&5
+   echo "$as_me:7755: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s out/conftest2.$ac_objext
    then
      # The compiler can only warn and ignore the option if not recognized
@@ -7801,11 +7803,11 @@ else
    -e 's:.*FLAGS}\{0,1\} :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:7804: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:7806: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>out/conftest.err)
    ac_status=$?
    cat out/conftest.err >&5
-   echo "$as_me:7808: \$? = $ac_status" >&5
+   echo "$as_me:7810: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s out/conftest2.$ac_objext
    then
      # The compiler can only warn and ignore the option if not recognized
@@ -10185,7 +10187,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 10188 "configure"
+#line 10190 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -10281,7 +10283,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 10284 "configure"
+#line 10286 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -11192,6 +11194,14 @@ cat >>confdefs.h <<_ACEOF
 _ACEOF
 
 
+# Check whether --enable-unique-history was given.
+if test "${enable_unique_history+set}" = set; then :
+  enableval=$enable_unique_history;
+$as_echo "#define CONFIG_UNIQUE_HISTORY /**/" >>confdefs.h
+
+fi
+
+
 # Restore gnu89 inline semantics on gcc 4.3 and newer
 saved_cflags="$CFLAGS"
 CFLAGS="$CFLAGS -fgnu89-inline"
diff --git a/configure.ac b/configure.ac
index 598df12..5bd3472 100644
--- a/configure.ac
+++ b/configure.ac
@@ -83,6 +83,10 @@ if test $HIST_SIZE -lt 1; then
 fi
 AC_DEFINE_UNQUOTED(HIST_SIZE, $HIST_SIZE, [Number of lines in history.])
 
+AC_ARG_ENABLE(unique-history,
+   [  --enable-unique-history        Uniqify scrollback history, i.e., don't save dupes.],
+   AC_DEFINE([CONFIG_UNIQUE_HISTORY],, [Don't save command if same as last one.]))
+
 # Restore gnu89 inline semantics on gcc 4.3 and newer
 saved_cflags="$CFLAGS"
 CFLAGS="$CFLAGS -fgnu89-inline"
diff --git a/src/editline.c b/src/editline.c
index 71efcd2..aa14c99 100644
--- a/src/editline.c
+++ b/src/editline.c
@@ -1059,9 +1059,9 @@ char *readline(const char *prompt)
     DISPOSE(H.Lines[--H.Size]);
 
     if (line != NULL && *line != '\0'
-#if     defined(UNIQUE_HISTORY)
+#ifdef CONFIG_UNIQUE_HISTORY
         && !(H.Pos && strcmp((char *) line, (char *) H.Lines[H.Pos - 1]) == 0)
-#endif  /* defined(UNIQUE_HISTORY) */
+#endif
         && !(H.Size && strcmp((char *) line, (char *) H.Lines[H.Size - 1]) == 0)
     ) {
         hist_add(line);
@@ -1081,10 +1081,10 @@ void add_history(char *p __attribute__ ((unused)))
     if (p == NULL || *p == '\0')
         return;
 
-#if     defined(UNIQUE_HISTORY)
+#ifdef CONFIG_UNIQUE_HISTORY
     if (H.Pos && strcmp(p, (char *) H.Lines[H.Pos - 1]) == 0)
         return;
-#endif  /* defined(UNIQUE_HISTORY) */
+#endif
     if (H.Size && strcmp(p, (char *) H.Lines[H.Size - 1]) == 0)
         return;
     hist_add((char *)p);