1 files changed, 20 insertions, 0 deletions

diff --git a/custom/opossum-wrapper.nix b/custom/opossum-wrapper.nix
new file mode 100644
index 00000000..2a2a1bff
--- /dev/null
+++ b/custom/opossum-wrapper.nix
@@ -0,0 +1,20 @@
+{ stdenv
+, ghcWithPackages
+, makeWrapper
+, opossum
+, additionalPackages ? (p: [])
+}:
+
+let
+  myEnv = ghcWithPackages (p: with p; [ beuteltier opossum ] ++ additionalPackages p);
+in stdenv.mkDerivation {
+  name = "opossum-wrapper";
+
+  nativeBuildInputs = [ makeWrapper ];
+
+  buildCommand = ''
+    mkdir -p $out/bin
+    makeWrapper ${opossum}/bin/opossum $out/bin/opossum \
+      --set NIX_GHC ${myEnv}/bin/ghc
+  '';
+}