PATCH: fix configure warning.

[Peter Stephenson <pws@xxxxxxx>]

This fixes a warning from configure 2.59 about trying to compile
sys/ptem.h.  The header is present but won't compile.  This causes
configure to execute AC_SOMETHING_ROTTEN_IN_THE_STATE_OF_DENMARK (or
equivalent).

The corresponding section of system.h uses the test to #include both
sys/stream.h and sys/ptem.h.  According to the name, we are looking
for struct winsize.  So a better test would seem to be to #include both
files and see if we can compile a reference to struct winsize.  This
passes without a grumble both with and without streams support.
(Actually, at least on Solaris 8, winsize isn't defined inside ptem.h,
so the old message was fallacious.)

Next stop is curses.

Index: configure.ac
===================================================================
RCS file: /cvsroot/zsh/zsh/configure.ac,v
retrieving revision 1.4
diff -u -r1.4 configure.ac
--- configure.ac	14 Feb 2004 18:50:16 -0000	1.4
+++ configure.ac	17 Feb 2004 11:17:53 -0000
@@ -562,8 +562,17 @@
 fi
  
 AH_TEMPLATE([WINSIZE_IN_PTEM],
-[Define if your system defines `struct winsize' in sys/ptem.h.])
-AC_CHECK_HEADER([sys/ptem.h], AC_DEFINE(WINSIZE_IN_PTEM))
+[Define if your should include sys/stream.h and sys/ptem.h.])
+AC_CACHE_CHECK(for streams headers including struct winsize,
+ac_cv_winsize_in_ptem,
+[AC_TRY_COMPILE([#include <sys/stream.h>
+#include <sys/ptem.h>],
+[struct winsize wsz],
+ac_cv_winsize_in_ptem=yes,
+ac_cv_winsize_in_ptem=no)])
+if test $ac_cv_winsize_in_ptem = yes; then
+  AC_DEFINE(WINSIZE_IN_PTEM)
+fi
 
 dnl -------------------
 dnl CHECK FOR LIBRARIES

-- 
Peter Stephenson <pws@xxxxxxx>                  Software Engineer
CSR Ltd., Science Park, Milton Road,
Cambridge, CB4 0WH, UK                          Tel: +44 (0)1223 692070


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