diff --git a/CMakeLists.txt b/CMakeLists.txt
index 687176c..a0a6c75 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -123,6 +123,8 @@
 set(LLVM_TARGET_ARCH "host"
   CACHE STRING "Set target to use for LLVM JIT or use \"host\" for automatic detection.")
 
+option(LLVM_ENABLE_CURSES "Use curses to detect terminal info if available." ON)
+
 option(LLVM_ENABLE_THREADS "Use threads if available." ON)
 
 option(LLVM_ENABLE_ZLIB "Use zlib for compression/decompression if available." ON)
diff --git a/autoconf/configure.ac b/autoconf/configure.ac
index 5be25af..30481ea 100644
--- a/autoconf/configure.ac
+++ b/autoconf/configure.ac
@@ -1072,6 +1072,17 @@
 AC_DEFINE_UNQUOTED(BUG_REPORT_URL,"$withval",
                    [Bug report URL.])
 
+dnl --enable-curses: check whether the user wants to control use of curses:
+AC_ARG_ENABLE(curses,AS_HELP_STRING(
+  [--enable-curses],
+  [Use curses for querying terminal infomation if available (default is YES)]),
+  [case "$enableval" in
+    yes) llvm_cv_enable_curses="yes" ;;
+    no)  llvm_cv_enable_curses="no"  ;;
+    *) AC_MSG_ERROR([Invalid setting for --enable-curses. Use "yes" or "no"]) ;;
+  esac],
+  llvm_cv_enable_curses="yes")
+
 dnl --enable-libffi : check whether the user wants to turn off libffi:
 AC_ARG_ENABLE(libffi,AS_HELP_STRING(
   --enable-libffi,[Check for the presence of libffi (default is NO)]),
@@ -1378,6 +1389,14 @@
 dnl right libraries to link with.
 AC_SEARCH_LIBS(clock_gettime,rt)
 
+dnl The curses library is optional; used for querying terminal info
+if test "$llvm_cv_enable_curses" = "yes" ; then
+  dnl We need the has_color functionality in curses for it to be useful.
+  AC_SEARCH_LIBS(has_colors,curses ncurses ncursesw,
+                 AC_DEFINE([HAVE_CURSES],[1],
+                           [Define if curses provides the has_color() function on this platform.]))
+fi
+
 dnl libffi is optional; used to call external functions from the interpreter
 if test "$llvm_cv_enable_libffi" = "yes" ; then
   AC_SEARCH_LIBS(ffi_call,ffi,AC_DEFINE([HAVE_FFI_CALL],[1],
@@ -1554,6 +1573,11 @@
   AC_SUBST(HAVE_LIBZ, 0)
 fi
 
+dnl Try to find a suitable curses header.
+if test "$llvm_cv_enable_curses" = "yes" ; then
+  AC_CHECK_HEADERS([curses.h ncurses.h ncursesw.h ncurses/curses.h ncursesw/curses.h])
+fi
+
 dnl Try to find ffi.h.
 if test "$llvm_cv_enable_libffi" = "yes" ; then
   AC_CHECK_HEADERS([ffi.h ffi/ffi.h])
diff --git a/cmake/config-ix.cmake b/cmake/config-ix.cmake
index 85c4d81..0567820 100755
--- a/cmake/config-ix.cmake
+++ b/cmake/config-ix.cmake
@@ -74,6 +74,12 @@
 check_include_file(mach/mach.h HAVE_MACH_MACH_H)
 check_include_file(mach-o/dyld.h HAVE_MACH_O_DYLD_H)
 
+check_include_file(curses.h HAVE_CURSES_H)
+check_include_file(ncurses.h HAVE_NCURSES_H)
+check_include_file(ncursesw.h HAVE_NCURSESW_H)
+check_include_file(ncurses/curses.h HAVE_NCURSES_CURSES_H)
+check_include_file(ncursesw/curses.h HAVE_NCURSESW_CURSES_H)
+
 # library checks
 if( NOT PURE_WINDOWS )
   check_library_exists(pthread pthread_create "" HAVE_LIBPTHREAD)
@@ -97,6 +103,19 @@
   else()
     set(HAVE_LIBZ 0)
   endif()
+  if(LLVM_ENABLE_CURSES)
+    check_library_exists(curses has_colors "" HAVE_CURSES)
+    if(NOT HAVE_CURSES)
+      check_library_exists(ncurses has_colors "" HAVE_NCURSES)
+      set(HAVE_CURSES ${HAVE_NCURSES})
+      if(NOT HAVE_CURSES)
+        check_library_exists(ncursesw has_colors "" HAVE_NCURSESW)
+        set(HAVE_CURSES ${HAVE_NCURSESW})
+      endif()
+    endif()
+  else()
+    set(HAVE_CURSES 0)
+  endif()
 endif()
 
 # function checks
diff --git a/cmake/modules/LLVM-Config.cmake b/cmake/modules/LLVM-Config.cmake
index 2ddc0b2..3e2447a 100644
--- a/cmake/modules/LLVM-Config.cmake
+++ b/cmake/modules/LLVM-Config.cmake
@@ -10,6 +10,15 @@
       if( HAVE_LIBDL )
         set(system_libs ${system_libs} ${CMAKE_DL_LIBS})
       endif()
+      if(LLVM_ENABLE_CURSES)
+        if(HAVE_NCURSESW)
+          set(system_libs ${system_libs} ncursesw)
+        elseif(HAVE_NCURSES)
+          set(system_libs ${system_libs} ncurses)
+        elseif(HAVE_CURSES)
+          set(system_libs ${system_libs} curses)
+        endif()
+      endif()
       if( LLVM_ENABLE_THREADS AND HAVE_LIBPTHREAD )
         set(system_libs ${system_libs} pthread)
       endif()
diff --git a/cmake/modules/LLVMConfig.cmake.in b/cmake/modules/LLVMConfig.cmake.in
index f0b8c14..ae2bc59 100644
--- a/cmake/modules/LLVMConfig.cmake.in
+++ b/cmake/modules/LLVMConfig.cmake.in
@@ -20,6 +20,8 @@
 
 set(LLVM_TOOLS_BINARY_DIR @LLVM_TOOLS_BINARY_DIR@)
 
+set(LLVM_ENABLE_CURSES @LLVM_ENABLE_CURSES@)
+
 set(LLVM_ENABLE_THREADS @LLVM_ENABLE_THREADS@)
 
 set(LLVM_ENABLE_ZLIB @LLVM_ENABLE_ZLIB@)
diff --git a/configure b/configure
index 242f764..a148711 100755
--- a/configure
+++ b/configure
@@ -1453,6 +1453,8 @@
                           target1,target2,... (default=disable)
   --enable-bindings       Build specific language bindings:
                           all,auto,none,{binding-name} (default=auto)
+  --enable-curses         Use curses for querying terminal infomation if
+                          available (default is YES)
   --enable-libffi         Check for the presence of libffi (default is NO)
   --enable-ltdl-install   install libltdl
 
@@ -6004,6 +6006,20 @@
 _ACEOF
 
 
+# Check whether --enable-curses was given.
+if test "${enable_curses+set}" = set; then
+  enableval=$enable_curses; case "$enableval" in
+    yes) llvm_cv_enable_curses="yes" ;;
+    no)  llvm_cv_enable_curses="no"  ;;
+    *) { { echo "$as_me:$LINENO: error: Invalid setting for --enable-curses. Use \"yes\" or \"no\"" >&5
+echo "$as_me: error: Invalid setting for --enable-curses. Use \"yes\" or \"no\"" >&2;}
+   { (exit 1); exit 1; }; } ;;
+  esac
+else
+  llvm_cv_enable_curses="yes"
+fi
+
+
 # Check whether --enable-libffi was given.
 if test "${enable_libffi+set}" = set; then
   enableval=$enable_libffi; case "$enableval" in
@@ -10545,7 +10561,7 @@
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<EOF
-#line 10548 "configure"
+#line 10564 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -12252,6 +12268,112 @@
 fi
 
 
+if test "$llvm_cv_enable_curses" = "yes" ; then
+    { echo "$as_me:$LINENO: checking for library containing has_colors" >&5
+echo $ECHO_N "checking for library containing has_colors... $ECHO_C" >&6; }
+if test "${ac_cv_search_has_colors+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  ac_func_search_save_LIBS=$LIBS
+cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char has_colors ();
+int
+main ()
+{
+return has_colors ();
+  ;
+  return 0;
+}
+_ACEOF
+for ac_lib in '' curses ncurses ncursesw; do
+  if test -z "$ac_lib"; then
+    ac_res="none required"
+  else
+    ac_res=-l$ac_lib
+    LIBS="-l$ac_lib  $ac_func_search_save_LIBS"
+  fi
+  rm -f conftest.$ac_objext conftest$ac_exeext
+if { (ac_try="$ac_link"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_link") 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } &&
+	 { ac_try='test -z "$ac_c_werror_flag" || test ! -s conftest.err'
+  { (case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_try") 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; } &&
+	 { ac_try='test -s conftest$ac_exeext'
+  { (case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_try") 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  ac_cv_search_has_colors=$ac_res
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+
+fi
+
+rm -f core conftest.err conftest.$ac_objext \
+      conftest$ac_exeext
+  if test "${ac_cv_search_has_colors+set}" = set; then
+  break
+fi
+done
+if test "${ac_cv_search_has_colors+set}" = set; then
+  :
+else
+  ac_cv_search_has_colors=no
+fi
+rm conftest.$ac_ext
+LIBS=$ac_func_search_save_LIBS
+fi
+{ echo "$as_me:$LINENO: result: $ac_cv_search_has_colors" >&5
+echo "${ECHO_T}$ac_cv_search_has_colors" >&6; }
+ac_res=$ac_cv_search_has_colors
+if test "$ac_res" != no; then
+  test "$ac_res" = "none required" || LIBS="$ac_res $LIBS"
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_CURSES 1
+_ACEOF
+
+fi
+
+fi
+
 if test "$llvm_cv_enable_libffi" = "yes" ; then
   { echo "$as_me:$LINENO: checking for library containing ffi_call" >&5
 echo $ECHO_N "checking for library containing ffi_call... $ECHO_C" >&6; }
@@ -16421,6 +16543,182 @@
 
 fi
 
+if test "$llvm_cv_enable_curses" = "yes" ; then
+
+
+
+
+
+for ac_header in curses.h ncurses.h ncursesw.h ncurses/curses.h ncursesw/curses.h
+do
+as_ac_Header=`echo "ac_cv_header_$ac_header" | $as_tr_sh`
+if { as_var=$as_ac_Header; eval "test \"\${$as_var+set}\" = set"; }; then
+  { echo "$as_me:$LINENO: checking for $ac_header" >&5
+echo $ECHO_N "checking for $ac_header... $ECHO_C" >&6; }
+if { as_var=$as_ac_Header; eval "test \"\${$as_var+set}\" = set"; }; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+fi
+ac_res=`eval echo '${'$as_ac_Header'}'`
+	       { echo "$as_me:$LINENO: result: $ac_res" >&5
+echo "${ECHO_T}$ac_res" >&6; }
+else
+  # Is the header compilable?
+{ echo "$as_me:$LINENO: checking $ac_header usability" >&5
+echo $ECHO_N "checking $ac_header usability... $ECHO_C" >&6; }
+cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+$ac_includes_default
+#include <$ac_header>
+_ACEOF
+rm -f conftest.$ac_objext
+if { (ac_try="$ac_compile"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_compile") 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } &&
+	 { ac_try='test -z "$ac_c_werror_flag" || test ! -s conftest.err'
+  { (case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_try") 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; } &&
+	 { ac_try='test -s conftest.$ac_objext'
+  { (case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_try") 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  ac_header_compiler=yes
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+	ac_header_compiler=no
+fi
+
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+{ echo "$as_me:$LINENO: result: $ac_header_compiler" >&5
+echo "${ECHO_T}$ac_header_compiler" >&6; }
+
+# Is the header present?
+{ echo "$as_me:$LINENO: checking $ac_header presence" >&5
+echo $ECHO_N "checking $ac_header presence... $ECHO_C" >&6; }
+cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+#include <$ac_header>
+_ACEOF
+if { (ac_try="$ac_cpp conftest.$ac_ext"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_cpp conftest.$ac_ext") 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } >/dev/null; then
+  if test -s conftest.err; then
+    ac_cpp_err=$ac_c_preproc_warn_flag
+    ac_cpp_err=$ac_cpp_err$ac_c_werror_flag
+  else
+    ac_cpp_err=
+  fi
+else
+  ac_cpp_err=yes
+fi
+if test -z "$ac_cpp_err"; then
+  ac_header_preproc=yes
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+  ac_header_preproc=no
+fi
+
+rm -f conftest.err conftest.$ac_ext
+{ echo "$as_me:$LINENO: result: $ac_header_preproc" >&5
+echo "${ECHO_T}$ac_header_preproc" >&6; }
+
+# So?  What about this header?
+case $ac_header_compiler:$ac_header_preproc:$ac_c_preproc_warn_flag in
+  yes:no: )
+    { echo "$as_me:$LINENO: WARNING: $ac_header: accepted by the compiler, rejected by the preprocessor!" >&5
+echo "$as_me: WARNING: $ac_header: accepted by the compiler, rejected by the preprocessor!" >&2;}
+    { echo "$as_me:$LINENO: WARNING: $ac_header: proceeding with the compiler's result" >&5
+echo "$as_me: WARNING: $ac_header: proceeding with the compiler's result" >&2;}
+    ac_header_preproc=yes
+    ;;
+  no:yes:* )
+    { echo "$as_me:$LINENO: WARNING: $ac_header: present but cannot be compiled" >&5
+echo "$as_me: WARNING: $ac_header: present but cannot be compiled" >&2;}
+    { echo "$as_me:$LINENO: WARNING: $ac_header:     check for missing prerequisite headers?" >&5
+echo "$as_me: WARNING: $ac_header:     check for missing prerequisite headers?" >&2;}
+    { echo "$as_me:$LINENO: WARNING: $ac_header: see the Autoconf documentation" >&5
+echo "$as_me: WARNING: $ac_header: see the Autoconf documentation" >&2;}
+    { echo "$as_me:$LINENO: WARNING: $ac_header:     section \"Present But Cannot Be Compiled\"" >&5
+echo "$as_me: WARNING: $ac_header:     section \"Present But Cannot Be Compiled\"" >&2;}
+    { echo "$as_me:$LINENO: WARNING: $ac_header: proceeding with the preprocessor's result" >&5
+echo "$as_me: WARNING: $ac_header: proceeding with the preprocessor's result" >&2;}
+    { echo "$as_me:$LINENO: WARNING: $ac_header: in the future, the compiler will take precedence" >&5
+echo "$as_me: WARNING: $ac_header: in the future, the compiler will take precedence" >&2;}
+    ( cat <<\_ASBOX
+## ------------------------------------ ##
+## Report this to http://llvm.org/bugs/ ##
+## ------------------------------------ ##
+_ASBOX
+     ) | sed "s/^/$as_me: WARNING:     /" >&2
+    ;;
+esac
+{ echo "$as_me:$LINENO: checking for $ac_header" >&5
+echo $ECHO_N "checking for $ac_header... $ECHO_C" >&6; }
+if { as_var=$as_ac_Header; eval "test \"\${$as_var+set}\" = set"; }; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  eval "$as_ac_Header=\$ac_header_preproc"
+fi
+ac_res=`eval echo '${'$as_ac_Header'}'`
+	       { echo "$as_me:$LINENO: result: $ac_res" >&5
+echo "${ECHO_T}$ac_res" >&6; }
+
+fi
+if test `eval echo '${'$as_ac_Header'}'` = yes; then
+  cat >>confdefs.h <<_ACEOF
+#define `echo "HAVE_$ac_header" | $as_tr_cpp` 1
+_ACEOF
+
+fi
+
+done
+
+fi
+
 if test "$llvm_cv_enable_libffi" = "yes" ; then
 
 
diff --git a/include/llvm/Config/config.h.cmake b/include/llvm/Config/config.h.cmake
index b34c404..4b0aa4b 100644
--- a/include/llvm/Config/config.h.cmake
+++ b/include/llvm/Config/config.h.cmake
@@ -48,6 +48,12 @@
 /* Define to 1 if you have the `closedir' function. */
 #cmakedefine HAVE_CLOSEDIR ${HAVE_CLOSEDIR}
 
+/* Define if curses provides the has_color() function on this platform. */
+#cmakedefine HAVE_CURSES
+
+/* Define to 1 if you have the <curses.h> header file. */
+#cmakedefine HAVE_CURSES_H
+
 /* Define to 1 if you have the <cxxabi.h> header file. */
 #cmakedefine HAVE_CXXABI_H ${HAVE_CXXABI_H}
 
@@ -256,6 +262,18 @@
 /* Define if mmap() can map files into memory */
 #undef HAVE_MMAP_FILE
 
+/* Define to 1 if you have the <ncursesw/curses.h> header file. */
+#cmakedefine HAVE_NCURSESW_CURSES_H
+
+/* Define to 1 if you have the <ncursesw.h> header file. */
+#cmakedefine HAVE_NCURSESW_H
+
+/* Define to 1 if you have the <ncurses/curses.h> header file. */
+#cmakedefine HAVE_NCURSES_CURSES_H
+
+/* Define to 1 if you have the <ncurses.h> header file. */
+#cmakedefine HAVE_NCURSES_H
+
 /* Define to 1 if you have the <ndir.h> header file, and it defines `DIR'. */
 #cmakedefine HAVE_NDIR_H ${HAVE_NDIR_H}
 
diff --git a/include/llvm/Config/config.h.in b/include/llvm/Config/config.h.in
index 74b7829..7bb1caa 100644
--- a/include/llvm/Config/config.h.in
+++ b/include/llvm/Config/config.h.in
@@ -69,6 +69,12 @@
 /* can use __crashreporter_info__ */
 #undef HAVE_CRASHREPORTER_INFO
 
+/* Define if curses provides the has_color() function on this platform. */
+#undef HAVE_CURSES
+
+/* Define to 1 if you have the <curses.h> header file. */
+#undef HAVE_CURSES_H
+
 /* Define to 1 if you have the <cxxabi.h> header file. */
 #undef HAVE_CXXABI_H
 
@@ -282,6 +288,18 @@
 /* Define if mmap() can map files into memory */
 #undef HAVE_MMAP_FILE
 
+/* Define to 1 if you have the <ncursesw/curses.h> header file. */
+#undef HAVE_NCURSESW_CURSES_H
+
+/* Define to 1 if you have the <ncursesw.h> header file. */
+#undef HAVE_NCURSESW_H
+
+/* Define to 1 if you have the <ncurses/curses.h> header file. */
+#undef HAVE_NCURSES_CURSES_H
+
+/* Define to 1 if you have the <ncurses.h> header file. */
+#undef HAVE_NCURSES_H
+
 /* Define to 1 if you have the <ndir.h> header file, and it defines `DIR'. */
 #undef HAVE_NDIR_H
 
diff --git a/lib/Support/Unix/Process.inc b/lib/Support/Unix/Process.inc
index 1335b78..0a797f6 100644
--- a/lib/Support/Unix/Process.inc
+++ b/lib/Support/Unix/Process.inc
@@ -13,6 +13,8 @@
 
 #include "Unix.h"
 #include "llvm/ADT/Hashing.h"
+#include "llvm/Support/Mutex.h"
+#include "llvm/Support/MutexGuard.h"
 #include "llvm/Support/TimeValue.h"
 #ifdef HAVE_SYS_TIME_H
 #include <sys/time.h>
@@ -36,6 +38,25 @@
 #  include <termios.h>
 #endif
 
+// See if we can use curses to detect information about a terminal when
+// connected to one.
+#ifdef HAVE_CURSES
+# if defined(HAVE_CURSES_H)
+#  include <curses.h>
+# elif defined(HAVE_NCURSES_H)
+#  include <ncurses.h>
+# elif defined(HAVE_NCURSESW_H)
+#  include <ncursesw.h>
+# elif defined(HAVE_NCURSES_CURSES_H)
+#  include <ncurses/curses.h>
+# elif defined(HAVE_NCURSESW_CURSES_H)
+#  include <ncursesw/curses.h>
+# else
+#  error Have a curses library but unable to find a curses header!
+# endif
+# include <term.h>
+#endif
+
 //===----------------------------------------------------------------------===//
 //=== WARNING: Implementation here must contain only generic UNIX code that
 //===          is guaranteed to work on *all* UNIX variants.
@@ -245,22 +266,32 @@
   return getColumns(2);
 }
 
-static bool terminalHasColors() {
-  if (const char *term = std::getenv("TERM")) {
-    // Most modern terminals support ANSI escape sequences for colors.
-    // We could check terminfo, or have a list of known terms that support
-    // colors, but that would be overkill.
-    // The user can always ask for no colors by setting TERM to dumb, or
-    // using a commandline flag.
-    return strcmp(term, "dumb") != 0;
-  }
+static bool terminalHasColors(int fd) {
+#ifdef HAVE_CURSES
+  // First, acquire a global lock because the curses C routines are thread
+  // hostile.
+  static sys::Mutex M;
+  MutexGuard G(M);
+
+  int errret = 0;
+  if (setupterm((char *)0, fd, &errret) != OK)
+    // Regardless of why, if we can't get terminfo, we shouldn't try to print
+    // colors.
+    return false;
+
+  // Test whether the terminal as set up supports color output.
+  if (has_colors() == TRUE)
+    return true;
+#endif
+
+  // Otherwise, be conservative.
   return false;
 }
 
 bool Process::FileDescriptorHasColors(int fd) {
   // A file descriptor has colors if it is displayed and the terminal has
   // colors.
-  return FileDescriptorIsDisplayed(fd) && terminalHasColors();
+  return FileDescriptorIsDisplayed(fd) && terminalHasColors(fd);
 }
 
 bool Process::StandardOutHasColors() {