rework

build.nix

@@ -2,17 +2,34 @@
   cmake,
   ninja,
   eigen,
+  fftw,
+  clang-tools,
   python3Packages,
+  doCheck ? false,
+  gtest,
 }:
 python3Packages.buildPythonPackage {
   pname = "slopefit";
   version = "0.1.0";
   pyproject = true;
 
-  buildInputs = [ eigen ];
+  dependencies = [
+    python3Packages.numpy
+    python3Packages.matplotlib
+    python3Packages.pyside6
+    python3Packages.pandas
+    python3Packages.pyqtgraph
+  ];
+
+  buildInputs = [
+    eigen
+    fftw
+  ]
+  ++ (if doCheck then [ gtest ] else [ ]);
 
   nativeBuildInputs = [
     cmake
+    clang-tools
     ninja
     python3Packages.scikit-build-core
     python3Packages.nanobind