Bring back the LINUX-IO check from the last commit

We need them for m_getfld(), too.

This reverts parts of the commit 33516e5b74bb4bb5c626d4ee42bd3a7a9faaabef.

diff --git a/configure.ac b/configure.ac
index 372f0e0..2cda6e0 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -318,6 +318,15 @@ AC_CHECK_HEADERS(fcntl.h crypt.h termcap.h \
                  langinfo.h wchar.h wctype.h iconv.h \
                  sys/param.h sys/time.h sys/stream.h )
 
+dnl
+dnl Checks for _IO_write_ptr. A Linuxism used by nmh on linux. We
+dnl really use a whole set of them, but this check should be
+dnl sufficient.
+dnl
+AC_CHECK_HEADER(libio.h, [
+  AC_EGREP_HEADER(_IO_write_ptr, libio.h, [
+    AC_DEFINE(LINUX_STDIO,1,[Use the Linux _IO_*_ptr defines from <libio.h>.]) ]) ])
+
 AC_CHECK_HEADER([sys/ptem.h], AC_DEFINE(WINSIZE_IN_PTEM,1,
   [Define to 1 if `struct winsize' requires <sys/ptem.h>.]),,
 [[#if HAVE_SYS_STREAM_H