This is slowly starting to be more realistic.

default.nix

@@ -0,0 +1,14 @@
+{ pkgs ? import <nixpkgs> {} }:
+let
+    inherit (pkgs) callPackage;
+    inherit (pkgs.lib) filterAttrs mapAttrs;
+    inherit (builtins) substring readDir;
+
+    here = ./.;
+
+    want = filterAttrs (name: type:
+        type == "directory" && (substring 0 1 name) != "."
+    ) (readDir here);
+in mapAttrs (name: type:
+    callPackage (import here/name)
+) want

sourcetrail/default.nix

@@ -0,0 +1,44 @@
+{lib, stdenv, pkgs, fetchurl, buildFHSUserEnv}:
+let 
+    libPath = lib.makeLibraryPath (with pkgs; [
+            zlib
+            expat
+    ]);
+
+    sourcetrail = stdenv.mkDerivation rec {
+        name = "sourcetrail-${version}";
+        version = "2018.2.77";
+
+        src = fetchurl {
+            name = "${name}.tar.gz";
+            url = "https://www.sourcetrail.com/downloads/${version}/linux/64bit";
+            sha256 = "1edfe95818f656840640d360df0cee72944af668d09b1a83cb6cb967ccaee719";
+            sha512 = "667b45449689d8f22a2a3ab2b9ad5d7d0c919fa61701e164927624df8843804b7b3f4c19e38e41da4afcff892a464157bea4cbffaa38e529bda364d1c284ee52";
+        };
+
+        phases = [ "unpackPhase" "installPhase" ];
+
+        installPhase = ''
+            mkdir -p $out/{opt/sourcetrail,usr,bin}
+            rm install.sh uninstall.sh
+            mv setup/share $out/usr/
+            mv * $out/opt/sourcetrail/
+
+            substituteInPlace $out/usr/share/applications/sourcetrail.desktop --replace '/usr/bin' "$out/bin"
+
+            for exe in $out/opt/sourcetrail/{Sourcetrail,sourcetrail_indexer}; do
+                patchelf \
+                    --set-interpreter "${stdenv.cc.bintools.dynamicLinker}" \
+                    $exe
+            done
+
+            ln -s $out/opt/sourcetrail/Sourcetrail.sh $out/bin/sourcetrail
+        '';
+    };
+in buildFHSUserEnv rec {
+    name = sourcetrail.name;
+
+    profile = "LD_LIBRARY_PATH=${libPath}:$LD_LIBRARY_PATH";
+    targetPkgs = pkgs: [ sourcetrail ];
+    runScript = "sourcetrail";
+}