1 files changed, 35 insertions, 0 deletions
diff --git a/m4/winsz.m4 b/m4/winsz.m4
new file mode 100644
index 000000000..163e512bd
--- /dev/null
+++ b/m4/winsz.m4
@@ -0,0 +1,35 @@
+dnl From Jim Meyering.
+
+# serial 1
+
+AC_DEFUN(AM_HEADER_TIOCGWINSZ_NEEDS_SYS_IOCTL,
+[AC_REQUIRE([AM_SYS_POSIX_TERMIOS])
+ AC_CACHE_CHECK([whether use of TIOCGWINSZ requires sys/ioctl.h],
+	        am_cv_sys_tiocgwinsz_needs_sys_ioctl_h,
+  [am_cv_sys_tiocgwinsz_needs_sys_ioctl_h=no
+
+  gwinsz_in_termios_h=no
+  if test $am_cv_sys_posix_termios = yes; then
+    AC_EGREP_CPP([yes],
+    [#include <sys/types.h>
+#     include <termios.h>
+#     ifdef TIOCGWINSZ
+        yes
+#     endif
+    ], gwinsz_in_termios_h=yes)
+  fi
+
+  if test $gwinsz_in_termios_h = no; then
+    AC_EGREP_CPP([yes],
+    [#include <sys/types.h>
+#     include <sys/ioctl.h>
+#     ifdef TIOCGWINSZ
+        yes
+#     endif
+    ], am_cv_sys_tiocgwinsz_needs_sys_ioctl_h=yes)
+  fi
+  ])
+  if test $am_cv_sys_tiocgwinsz_needs_sys_ioctl_h = yes; then
+    AC_DEFINE(GWINSZ_IN_SYS_IOCTL)
+  fi
+])