bitcoin-abc: build against qt5

pkgs/applications/altcoins/bitcoin-abc.nix

@@ -1,5 +1,5 @@
 { stdenv, fetchFromGitHub, pkgconfig, autoreconfHook, openssl, db48, boost
-, zlib, miniupnpc, qt4, utillinux, protobuf, qrencode, libevent
+, zlib, miniupnpc, qt5, utillinux, protobuf, qrencode, libevent
 , withGui }:
 
 with stdenv.lib;
@@ -16,13 +16,15 @@ stdenv.mkDerivation rec {
     sha256 = "1fygn6cc99iasg5g5jyps5ps873hfnn4ln4hsmcwlwiqd591qxyv";
   };
 
+  patches = [ ./fix-bitcoin-qt-build.patch ];
+
   nativeBuildInputs = [ pkgconfig autoreconfHook ];
   buildInputs = [ openssl db48 boost zlib
                   miniupnpc utillinux protobuf libevent ]
-                  ++ optionals withGui [ qt4 qrencode ];
+                  ++ optionals withGui [ qt5.qtbase qt5.qttools qrencode ];
 
   configureFlags = [ "--with-boost-libdir=${boost.out}/lib" ]
-                     ++ optionals withGui [ "--with-gui=qt4" ];
+                     ++ optionals withGui [ "--with-gui=qt5" ];
 
   meta = {
     description = "Peer-to-peer electronic cash system (Cash client)";

pkgs/applications/altcoins/fix-bitcoin-qt-build.patch

@@ -0,0 +1,15 @@
+--- bitcoin-abc-v0.15.0-src/build-aux/m4/bitcoin_qt.m4	1970-01-01 01:00:01.000000000 +0100
++++ bitcoin-abc-v0.15.0-src.org/build-aux/m4/bitcoin_qt.m4	2017-09-27 23:38:44.748384197 +0100
+@@ -35,11 +35,7 @@
+ dnl Output: $1 is set to the path of $2 if found. $2 are searched in order.
+ AC_DEFUN([BITCOIN_QT_PATH_PROGS],[
+   BITCOIN_QT_CHECK([
+-    if test "x$3" != "x"; then
+-      AC_PATH_PROGS($1,$2,,$3)
+-    else
+-      AC_PATH_PROGS($1,$2)
+-    fi
++    AC_PATH_PROGS($1,$2)
+     if test "x$$1" = "x" && test "x$4" != "xyes"; then
+       BITCOIN_QT_FAIL([$1 not found])
+     fi