diff --git a/pkgs/development/libraries/aqbanking/default.nix b/pkgs/development/libraries/aqbanking/default.nix
index ee985e70941..7fd511f4272 100644
--- a/pkgs/development/libraries/aqbanking/default.nix
+++ b/pkgs/development/libraries/aqbanking/default.nix
@@ -16,11 +16,17 @@ stdenv.mkDerivation rec {
     sha256 = "1x0isvpk43rq2zlyyb9p0kgjmqv7yq07vgkiprw3f5sjkykvxw6d";
   };
 
+  postPatch = ''
+    sed -i -e '/^aqbanking_plugindir=/ {
+      c aqbanking_plugindir="\''${libdir}/gwenhywfar/plugins"
+    }' configure
+  '';
+
   buildInputs = [ gmp gwenhywfar libtool libxml2 libxslt xmlsec zlib ];
 
   nativeBuildInputs = [ pkgconfig ];
 
-  configureFlags = "--with-gwen-dir=${gwenhywfar}";
+  configureFlags = [ "--with-gwen-dir=${gwenhywfar}" ];
 
   meta = with stdenv.lib; {
     description = "An interface to banking tasks, file formats and country information";
diff --git a/pkgs/development/libraries/gwenhywfar/default.nix b/pkgs/development/libraries/gwenhywfar/default.nix
index 8cec26139de..8fb96e078ac 100644
--- a/pkgs/development/libraries/gwenhywfar/default.nix
+++ b/pkgs/development/libraries/gwenhywfar/default.nix
@@ -2,7 +2,6 @@
 
 stdenv.mkDerivation rec {
   name = "gwenhywfar-${version}";
-
   version = "4.15.3";
 
   src = let
@@ -15,6 +14,33 @@ stdenv.mkDerivation rec {
     sha256 = "0fp67s932x66xfljb26zbrn8ambbc5y5c3hllr6l284nr63qf3ka";
   };
 
+  postPatch = let
+    pluginSearchPaths = [
+      "/run/current-system/sw/lib/gwenhywfar/plugins"
+      ".nix-profile/lib/gwenhywfar/plugins"
+    ];
+    isRelative = path: builtins.substring 0 1 path != "/";
+    mkSearchPath = path: ''
+      p; g; s,\<PLUGINDIR\>,"${path}",g;
+    '' + stdenv.lib.optionalString (isRelative path) ''
+      s/AddPath(\(.*\));/AddRelPath(\1, GWEN_PathManager_RelModeHome);/g
+    '';
+
+  in ''
+    sed -i -e '/GWEN_PathManager_DefinePath.*GWEN_PM_PLUGINDIR/,/^#endif/ {
+      /^#if/,/^#endif/ {
+        H; /^#endif/ {
+          ${stdenv.lib.concatMapStrings mkSearchPath pluginSearchPaths}
+        }
+      }
+    }' src/gwenhywfar.c
+
+    # Strip off the effective SO version from the path so that for example
+    # "lib/gwenhywfar/plugins/60" becomes just "lib/gwenhywfar/plugins".
+    sed -i -e '/^gwenhywfar_plugindir=/s,/\''${GWENHYWFAR_SO_EFFECTIVE},,' \
+      configure
+  '';
+
   propagatedBuildInputs = [ gnutls libgcrypt ];
 
   buildInputs = [ gtk qt4 ];