diff -up gnucap-0.35/src/plot.cc~ gnucap-0.35/src/plot.cc
--- gnucap-0.35/src/plot.cc~	2016-04-26 09:16:25.000000000 +0200
+++ gnucap-0.35/src/plot.cc	2016-04-26 09:18:43.392162278 +0200
@@ -231,9 +231,9 @@ static void plotarg(
 	double yhi,
 	double zhi)
 {
-  auto char adata[MAXWIDTH+1];     /* actual data. copy emptydata, insert */
+  char adata[MAXWIDTH+1];     /* actual data. copy emptydata, insert */
   char *xxs;				     /* string representation of xx */
-  memcpy(adata, emptydata, MAXWIDTH); /* copy prototype */
+  memcpy(adata, emptydata, MAXWIDTH + 1); /* copy prototype */
   xxs = ftos( xx, 11, 5, IO::formaat );
   if (zz != NOT_VALID) {
     adata[point(zz,zlo,zhi,CONSSCALE,0,1)] = '+';/* zap data into string */