Error compiling units-2.11 on Mac OS X

units-2.11-compile-error.log

AndrewMBP:units-2.11 andrew$ ./configure
checking for gcc... gcc
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables...
checking whether we are cross compiling... no
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ISO C89... none needed
checking for gcc option to accept ISO C99... none needed
checking for an ANSI C-conforming const... yes
checking for a BSD-compatible install... /usr/local/bin/ginstall -c
checking for a thread-safe mkdir -p... /usr/local/bin/gmkdir -p
checking for library containing sin... none required
checking for readline in -lreadline... yes
checking how to run the C preprocessor... gcc -E
checking for grep that handles long lines and -e... /usr/bin/grep
checking for egrep... /usr/bin/grep -E
checking for ANSI C header files... yes
checking for sys/types.h... yes
checking for sys/stat.h... yes
checking for stdlib.h... yes
checking for string.h... yes
checking for memory.h... yes
checking for strings.h... yes
checking for inttypes.h... yes
checking for stdint.h... yes
checking for unistd.h... yes
checking for string.h... (cached) yes
checking for stdlib.h... (cached) yes
checking for strchr... yes
checking for strspn... yes
checking for strtok... yes
checking for setenv... yes
checking for setlocale... yes
checking for locale and UTF-8 support... yes
checking for isfinite... yes
checking for mksinfo... no
checking for python... /usr/bin/python
configure: creating ./config.status
config.status: creating Makefile

AndrewMBP:units-2.11 andrew$ make install
gcc -DUNITSFILE=\"/usr/local/share/units/definitions.units\" -DLOCALEMAP=\"/usr/local/share/units/locale_map.txt\" -DREADLINE -DSUPPORT_UTF8 -DPACKAGE_NAME=\"GNU\ units\" -DPACKAGE_TARNAME=\"units\" -DPACKAGE_VERSION=\"2.11\" -DPACKAGE_STRING=\"GNU\ units\ 2.11\" -DPACKAGE_BUGREPORT=\"[email protected]\" -DPACKAGE_URL=\"http://www.gnu.org/software/units/\" -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -g -O2 -I. -c units.c
units.c:3693:3: error: use of undeclared identifier 'rl_completion_suppress_append'
  rl_completion_suppress_append = 1;
  ^
units.c:4041:12: warning: use of logical '&&' with constant operand
      [-Wconstant-logical-operand]
  if (!map && strlen(DATADIR)) {
           ^  ~~~~~~~~~~~~~~~
units.c:4041:12: note: use '&' for a bitwise operation
  if (!map && strlen(DATADIR)) {
           ^~
           &
units.c:4041:12: note: remove constant to silence this warning
  if (!map && strlen(DATADIR)) {
          ~^~~~~~~~~~~~~~~~~~
units.c:4135:17: warning: use of logical '&&' with constant operand
      [-Wconstant-logical-operand]
  if (!testfile && strlen(DATADIR)) {
                ^  ~~~~~~~~~~~~~~~
units.c:4135:17: note: use '&' for a bitwise operation
  if (!testfile && strlen(DATADIR)) {
                ^~
                &
units.c:4135:17: note: remove constant to silence this warning
  if (!testfile && strlen(DATADIR)) {
               ~^~~~~~~~~~~~~~~~~~
2 warnings and 1 error generated.
make: *** [units.o] Error 1