--- transfig/sys.c
+++ transfig/sys.c	2009-10-09 14:17:09.932073007 +0200
@@ -37,6 +37,7 @@ char *sysls()
 	i += 1;
 	c = fgetc(ls);
   }
+  pclose(ls);
   sysbuf[i] = '\0';
   return sysbuf;
 }