Index: gnuplot-4.2.6/src/gplt_x11.c
===================================================================
--- gnuplot-4.2.6.orig/src/gplt_x11.c	2010-03-04 10:45:10.000000000 +0100
+++ gnuplot-4.2.6/src/gplt_x11.c	2010-03-04 11:59:35.000000000 +0100
@@ -1189,7 +1189,7 @@ static int
 read_input()
 {
     const int rdbuf_size = 10 * Nbuf;
-    static char rdbuf[rdbuf_size+1];
+    static char rdbuf[10*Nbuf+1];
     static int total_chars;
     static int rdbuf_offset;
     static int buf_offset;