X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fjm-winsz1.m4;h=2f2ec9002c2e3a8e2a5070c077d3cb8debf6b8f1;hb=cdb16e449503bbdc0cb239ebae9372227c250dfd;hp=0c43ac32e7c3f77d41eecd8072264c248615beb6;hpb=ee76465ad82c04707c78ff3ed723358217c9e34f;p=gnulib.git

diff --git a/m4/jm-winsz1.m4 b/m4/jm-winsz1.m4
index 0c43ac32e..2f2ec9002 100644
--- a/m4/jm-winsz1.m4
+++ b/m4/jm-winsz1.m4
@@ -1,5 +1,5 @@
-dnl From Jim Meyering.
-#serial 4
+#serial 5
+dnl From Jim Meyering and Paul Eggert.
 AC_DEFUN([jm_HEADER_TIOCGWINSZ_IN_TERMIOS_H],
 [AC_REQUIRE([AM_SYS_POSIX_TERMIOS])
  AC_CACHE_CHECK([whether use of TIOCGWINSZ requires termios.h],
@@ -19,8 +19,21 @@ AC_DEFUN([jm_HEADER_TIOCGWINSZ_IN_TERMIOS_H],
 ])
 
 AC_DEFUN([jm_WINSIZE_IN_PTEM],
-  [AC_CHECK_HEADER([sys/ptem.h],
-		   AC_DEFINE(WINSIZE_IN_PTEM, 1,
-      [Define if your system defines `struct winsize' in sys/ptem.h.]))
-  ]
-)
+  [AC_REQUIRE([AM_SYS_POSIX_TERMIOS])
+   AC_CACHE_CHECK([whether use of struct winsize requires sys/ptem.h],
+     jm_cv_sys_struct_winsize_needs_sys_ptem_h,
+     [jm_cv_sys_struct_winsize_needs_sys_ptem_h=yes
+      if test $am_cv_sys_posix_termios = yes; then
+	AC_TRY_COMPILE([#include <termios.h>]
+	  [struct winsize x;],
+          [jm_cv_sys_struct_winsize_needs_sys_ptem_h=no])
+      fi
+      if test $jm_cv_sys_struct_winsize_needs_sys_ptem_h = yes; then
+	AC_TRY_COMPILE([#include <sys/ptem.h>],
+	  [struct winsize x;],
+	  [], [jm_cv_sys_struct_winsize_needs_sys_ptem_h=no])
+      fi])
+   if test $jm_cv_sys_struct_winsize_needs_sys_ptem_h = yes; then
+     AC_DEFINE([WINSIZE_IN_PTEM], 1,
+       [Define if sys/ptem.h is required for struct winsize.])
+   fi])