This command
	echo 'for(;;) {}' |./bc/bc
produces a segfault on RH and SuSE.

This patch, extracted from debian, fixes it.

--- bc-1.06.orig/bc/main.c
+++ bc-1.06/bc/main.c
@@ -93,6 +93,9 @@
 
       switch (optch)
 	{
+	case 0: /* Long option setting a var. */
+	  break;
+
 	case 'c':  /* compile only */
 	  compile_only = TRUE;
 	  break;
--- bc-1.06.orig/bc/bc.y
+++ bc-1.06/bc/bc.y
@@ -203,7 +203,7 @@
 			    {
 			      if ($4 & 2)
 				warn ("Comparison in first for expression");
-			      if ($4 >= 0)
+			      if ($4 <= 0)
 				generate ("p");
 			      $4 = next_label++;
 			      sprintf (genstr, "N%1d:", $4);
@@ -211,7 +211,7 @@
 			    }
 			  opt_expression ';'
 			    {
-			      if ($7 < 0) generate ("1");
+			      if ($7 &16 ) generate ("1");
 			      $7 = next_label++;
 			      sprintf (genstr, "B%1d:J%1d:", $7, break_label);
 			      generate (genstr);
--- bc-1.06.orig/bc/scan.l
+++ bc-1.06/bc/scan.l
@@ -44,7 +44,9 @@
 #endif
 
 /* Force . as last for now. */
-#define DOT_IS_LAST
+/* edd 9 June 2001 commented out for GNU readline-4.2
+   #define DOT_IS_LAST
+*/
 
 /* We want to define our own yywrap. */
 #undef yywrap
@@ -143,7 +145,9 @@
 
 /* Definitions for readline access. */
 extern FILE *rl_instream;
-_PROTOTYPE(char *readline, (char *));
+/* edd 9 June 2001 commented out for GNU readline-4.2
+   _PROTOTYPE(char *readline, (char *)); 
+*/
 
 /* rl_input puts upto MAX characters into BUF with the number put in
    BUF placed in *RESULT.  If the yy input file is the same as
--- bc-1.06.orig/bc/load.c
+++ bc-1.06/bc/load.c
@@ -156,7 +156,7 @@
   long  label_no;
   long  vaf_name;	/* variable, array or function number. */
   long  func;
-  program_counter save_adr;
+  static program_counter save_adr;
 
   /* Initialize. */
   str = code;