Better portability patch for systems that don't define SYS_NMLN.

configure.in

@@ -76,6 +76,42 @@ AC_HEADER_STDC
 AC_CHECK_HEADERS(fcntl.h sys/ioctl.h sys/time.h unistd.h)
 AC_CHECK_HEADERS(curses.h ncurses.h)
 
+dnl Check for particular preprocessor macros
+
+dnl Checking if sys/utsname.h is present and defines SYS_NMLN or _SYS_NAMELEN
+AC_CHECK_HEADER(sys/utsname.h, 
+
+AC_MSG_CHECKING(if sys/utsname.h defines SYS_NMLN)
+AC_TRY_RUN([[
+	#include <sys/utsname.h>
+	int main() {
+	char kver[SYS_NMLN];
+	return 0;
+	}
+]], [ 
+dnl then
+	AC_DEFINE(HAVE_SYS_NMLN)
+	AC_MSG_RESULT(yes) ], [
+dnl else
+	AC_MSG_RESULT(no)
+	AC_MSG_CHECKING(if sys/utsname.h defines _SYS_NAMELEN)
+	AC_TRY_RUN([[
+		#include <sys/utsname.h>
+		int main() {
+		char kver[_SYS_NAMELEN];
+		return 0;
+		}
+	]], [ 
+	dnl then
+		AC_DEFINE(HAVE__SYS_NAMELEN)
+		AC_MSG_RESULT(yes) ], [
+	dnl else
+	AC_MSG_RESULT(no)
+	AC_MSG_WARN([sys/utsname.h does not define SYS_NMLN or _SYS_NAMELEN])],[:])
+],[:])
+
+, [AC_MSG_WARN([LCDproc client requires sys/utsname.h.])])
+
 dnl Checks for typedefs, structures, and compiler characteristics.
 AC_C_CONST
 AC_C_INLINE