diff --git a/autoconf/configure.ac b/autoconf/configure.ac
index 1e04b8c..cb217a5 100644
--- a/autoconf/configure.ac
+++ b/autoconf/configure.ac
@@ -823,8 +823,8 @@
 AC_HEADER_TIME
 
 AC_CHECK_HEADERS([dlfcn.h execinfo.h fcntl.h inttypes.h limits.h link.h])
-AC_CHECK_HEADERS([malloc.h setjmp.h signal.h stdint.h unistd.h utime.h])
-AC_CHECK_HEADERS([windows.h])
+AC_CHECK_HEADERS([malloc.h setjmp.h signal.h stdint.h termios.h unistd.h])
+AC_CHECK_HEADERS([utime.h windows.h])
 AC_CHECK_HEADERS([sys/mman.h sys/param.h sys/resource.h sys/time.h])
 AC_CHECK_HEADERS([sys/types.h sys/ioctl.h malloc/malloc.h mach/mach.h])
 if test "$ENABLE_THREADS" -eq 1 ; then
diff --git a/cmake/config-ix.cmake b/cmake/config-ix.cmake
index 7e4016f..adebb1b 100755
--- a/cmake/config-ix.cmake
+++ b/cmake/config-ix.cmake
@@ -34,6 +34,7 @@
 check_include_file(sys/stat.h HAVE_SYS_STAT_H)
 check_include_file(sys/time.h HAVE_SYS_TIME_H)
 check_include_file(sys/types.h HAVE_SYS_TYPES_H)
+check_include_file(termios.h HAVE_TERMIOS_H)
 check_include_file(unistd.h HAVE_UNISTD_H)
 check_include_file(utime.h HAVE_UTIME_H)
 check_include_file(windows.h HAVE_WINDOWS_H)
diff --git a/configure b/configure
index 2229b35..3a35277 100755
--- a/configure
+++ b/configure
@@ -28963,7 +28963,7 @@
 
 
 
-for ac_header in malloc.h setjmp.h signal.h stdint.h unistd.h utime.h
+for ac_header in malloc.h setjmp.h signal.h stdint.h termios.h unistd.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
@@ -29132,7 +29132,8 @@
 done
 
 
-for ac_header in windows.h
+
+for ac_header in utime.h windows.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
diff --git a/include/llvm/Config/config.h.cmake b/include/llvm/Config/config.h.cmake
index 443afb1..caabf07 100644
--- a/include/llvm/Config/config.h.cmake
+++ b/include/llvm/Config/config.h.cmake
@@ -419,6 +419,9 @@
 /* Define to 1 if the system has the type `uint64_t'. */
 #undef HAVE_UINT64_T
 
+/* Define to 1 if you have the <termios.h> header file. */
+#cmakedefine HAVE_TERMIOS_H ${HAVE_TERMIOS_H}
+
 /* Define to 1 if you have the <unistd.h> header file. */
 #cmakedefine HAVE_UNISTD_H ${HAVE_UNISTD_H}
 
diff --git a/include/llvm/Config/config.h.in b/include/llvm/Config/config.h.in
index f0522e5..8ab67a4 100644
--- a/include/llvm/Config/config.h.in
+++ b/include/llvm/Config/config.h.in
@@ -419,6 +419,9 @@
 /* Define to 1 if you have <sys/wait.h> that is POSIX.1 compatible. */
 #undef HAVE_SYS_WAIT_H
 
+/* Define to 1 if you have the <termios.h> header file. */
+#undef HAVE_TERMIOS_H
+
 /* Define to 1 if the system has the type `uint64_t'. */
 #undef HAVE_UINT64_T
 
diff --git a/lib/System/Unix/Process.inc b/lib/System/Unix/Process.inc
index b1286b7..e4f37a1 100644
--- a/lib/System/Unix/Process.inc
+++ b/lib/System/Unix/Process.inc
@@ -27,6 +27,9 @@
 #ifdef HAVE_SYS_IOCTL_H
 #  include <sys/ioctl.h>
 #endif
+#ifdef HAVE_TERMIOS_H
+#  include <termios.h>
+#endif
 
 //===----------------------------------------------------------------------===//
 //=== WARNING: Implementation here must contain only generic UNIX code that
@@ -204,7 +207,7 @@
 
   unsigned Columns = 0;
 
-#ifdef HAVE_SYS_IOCTL_H
+#if defined(HAVE_SYS_IOCTL_H) && defined(HAVE_TERMIOS_H)
   // Try to determine the width of the terminal.
   struct winsize ws;
   if (ioctl(FileID, TIOCGWINSZ, &ws) == 0)