bviplus: fix build with gcc5 (inline semantics)

pkgs/applications/editors/bviplus/default.nix

@@ -1,17 +1,23 @@
-{ stdenv, lib, fetchurl, ncurses }:
+{ stdenv, fetchurl, ncurses }:
 
 stdenv.mkDerivation rec {
   name = "bviplus-${version}";
   version = "0.9.4";
+
   src = fetchurl {
-    url = "http://downloads.sourceforge.net/project/bviplus/bviplus/${version}/bviplus-${version}.tgz";
+    url = "mirror://sourceforge/project/bviplus/bviplus/${version}/bviplus-${version}.tgz";
     sha256 = "10x6fbn8v6i0y0m40ja30pwpyqksnn8k2vqd290vxxlvlhzah4zb";
   };
+
   buildInputs = [
     ncurses
   ];
+
+  patches = [ ./gcc5.diff ];
+
   makeFlags = "PREFIX=$(out)";
-  meta = with lib; {
+
+  meta = with stdenv.lib; {
     description = "ncurses based hex editor with a vim-like interface";
     homepage = "http://bviplus.sourceforge.net";
     license = licenses.gpl3;

pkgs/applications/editors/bviplus/gcc5.diff

@@ -0,0 +1,11 @@
+--- bviplus-0.9.4/vf_backend.c	2016-02-07 15:58:47.265405962 +0000
++++ bviplus-0.9.4/vf_backend.c	2016-02-07 16:04:30.020004919 +0000
+@@ -253,7 +253,7 @@
+ /*---------------------------
+ 
+   ---------------------------*/
+-inline void compute_percent_complete(off_t offset, off_t size, int *complete)
++extern void compute_percent_complete(off_t offset, off_t size, int *complete)
+ {
+   if (size == 0)
+   {