Making bc use readline. I prefer bc with readline.

svn path=/nixpkgs/trunk/; revision=14919

pkgs/tools/misc/bc/default.nix

@@ -1,4 +1,4 @@
-{stdenv, fetchurl, flex}:
+{stdenv, fetchurl, flex, readline}:
 
 stdenv.mkDerivation {
   name = "bc-1.0.6";
@@ -7,5 +7,9 @@ stdenv.mkDerivation {
     md5 = "d44b5dddebd8a7a7309aea6c36fda117";
   };
 
-  buildInputs = [flex];
+  patches = [ ./readlinefix.patch ];
+
+  configureFlags = "--with-readline";
+
+  buildInputs = [flex readline];
 }

pkgs/tools/misc/bc/readlinefix.patch

@@ -0,0 +1,11 @@
+diff -Naur bc-1.06.orig/bc/scan.l bc-1.06/bc/scan.l
+--- bc-1.06.orig/bc/scan.l      2000-09-13 13:25:47.000000000 -0500
++++ bc-1.06/bc/scan.l   2002-07-09 14:36:34.000000000 -0500
+@@ -143,7 +143,6 @@
+ 
+ /* Definitions for readline access. */
+ extern FILE *rl_instream;
+-_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

pkgs/top-level/all-packages.nix

@@ -422,7 +422,7 @@ let
   };
 
   bc = import ../tools/misc/bc {
-    inherit fetchurl stdenv flex;
+    inherit fetchurl stdenv flex readline;
   };
 
   bfr = import ../tools/misc/bfr {