diff -ur less-418.orig/configure.ac less-418/configure.ac

--- less-418.orig/configure.ac	2008-12-22 07:10:44.000000000 -0500

+++ less-418/configure.ac	2008-12-22 07:28:58.000000000 -0500

@@ -203,6 +203,8 @@

 	[Define HAVE_TIME_T if your system supports the "time_t" type.])

 AH_TEMPLATE([HAVE_STRERROR],

 	[Define HAVE_STRERROR if you have the strerror() function.])

+AH_TEMPLATE([HAVE_FSYNC],

+	[Define HAVE_FSYNC if fsync() on a tty works.])

 AH_TEMPLATE([HAVE_FILENO],

 	[Define HAVE_FILENO if you have the fileno() macro.])

 AH_TEMPLATE([HAVE_ERRNO],

@@ -251,7 +253,7 @@

 # Checks for library functions.

 AC_TYPE_SIGNAL

-AC_CHECK_FUNCS([fsync popen _setjmp sigprocmask sigsetmask snprintf stat system fchmod realpath])

+AC_CHECK_FUNCS([popen _setjmp sigprocmask sigsetmask snprintf stat system fchmod realpath])

 # AC_CHECK_FUNCS may not work for inline functions, so test these separately.

 AC_MSG_CHECKING(for memcpy)

@@ -298,6 +300,16 @@

 #endif], [static char *x; x = strerror(0);],

   [AC_MSG_RESULT(yes); AC_DEFINE(HAVE_STRERROR)], [AC_MSG_RESULT(no)])

+AC_MSG_CHECKING(for fsync)

+AC_TRY_RUN([

+#include <fcntl.h>

+#include <unistd.h>

+int main(void)

+{

+        int fd = open("/dev/tty", O_RDWR);

+        return fsync(fd);

+}], [AC_MSG_RESULT(yes); AC_DEFINE(HAVE_FSYNC)], [AC_MSG_RESULT(no)])

+

 AC_MSG_CHECKING(for sys_errlist)

 AC_TRY_LINK(, [extern char *sys_errlist[]; static char **x; x = sys_errlist;], 

   [AC_MSG_RESULT(yes); AC_DEFINE(HAVE_SYS_ERRLIST)], [AC_MSG_RESULT(no)])