Add patch to fix build for bip.

pkgs/applications/networking/irc/bip/bip-0.8.8-yyparse.patch

@@ -0,0 +1,11 @@
+--- bip-0.8.8/src/lex.l.orig
++++ bip-0.8.8/src/lex.l
+@@ -16,7 +16,7 @@
+ int linec;
+ #include "util.h"
+ extern list_t *root_list;
+-void yyparse(void);
++int yyparse(void);
+ void free_conf(list_t*);
+ int conf_error;
+ typedef struct bip bip_t;

pkgs/applications/networking/irc/bip/default.nix

@@ -36,6 +36,10 @@ in stdenv.mkDerivation {
     }
   ];
 
+  postPatch = ''
+    patch -p1 < ${./bip-0.8.8-yyparse.patch}
+  '';
+
   configureFlags = [ "--disable-pie" ];
 
   buildInputs = [ bison flex autoconf automake openssl ];
@@ -45,4 +49,4 @@ in stdenv.mkDerivation {
     homepage = http://bip.milkypond.org/;
     license = stdenv.lib.licenses.gpl2;
   };
-}
+}