diff --git a/CMakeLists.txt b/CMakeLists.txt
index 24c5b8f..4ccfd73 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -10,6 +10,8 @@ include(${ROOT_USE_FILE})
 
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
 set(CMAKE_INSTALL_BINDIR "bin" CACHE PATH "user executables (bin)")
+set(CMAKE_INSTALL_INCLUDEDIR "include" CACHE PATH "header files")
+set(CMAKE_INSTALL_LIBDIR "lib" CACHE PATH "libraries")
 
 if(ccache)
   set(CMAKE_C_COMPILER_LAUNCHER ccache)
diff --git a/default.nix b/default.nix
new file mode 100644
index 0000000..be897a6
--- /dev/null
+++ b/default.nix
@@ -0,0 +1,17 @@
+with import <nixpkgs> { };
+
+clangStdenv.mkDerivation {
+  name = "roofit";
+  src = ./.;
+
+  buildInputs = [
+    (root.overrideAttrs (old: { cmakeFlags = old.cmakeFlags ++ [ "-Droofit=OFF -Dtmva=OFF" ]; }))
+    cmake
+    gtest
+    gsl
+    pkg-config
+  ];
+
+  cmakeFlags = [
+  ];
+}
diff --git a/settings-dev.cmake b/settings-dev.cmake
new file mode 100644
index 0000000..6a8496f
--- /dev/null
+++ b/settings-dev.cmake
@@ -0,0 +1,7 @@
+set (CMAKE_BUILD_TYPE RelWithDebInfo CACHE STRING "" FORCE)
+set (CMAKE_INSTALL_PREFIX ../install CACHE STRING "" FORCE)
+set (CMAKE_INSTALL_BINDIR bin CACHE STRING "" FORCE)
+set (CMAKE_INSTALL_INCLUDEDIR include CACHE STRING "" FORCE)
+set (CMAKE_INSTALL_LIBDIR lib CACHE STRING "" FORCE)
+set (testing ON CACHE BOOL "" FORCE)
+set (mathmore ON CACHE BOOL "" FORCE)
diff --git a/setup.fish b/setup.fish
index cc00238..cedd707 100644
--- a/setup.fish
+++ b/setup.fish
@@ -1,2 +1,3 @@
 set -g ROOT_INCLUDE_PATH $PWD/install/include
 set -g -a LD_LIBRARY_PATH $PWD/install/lib
+set -g -a DYLD_LIBRARY_PATH $PWD/install/lib
diff --git a/setup.sh b/setup.sh
new file mode 100644
index 0000000..a222f14
--- /dev/null
+++ b/setup.sh
@@ -0,0 +1,3 @@
+export ROOT_INCLUDE_PATH=$PWD/install/include
+export LD_LIBRARY_PATH=$PWD/install/lib:$LD_LIBRARY_PATH
+export DYLD_LIBRARY_PATH=$PWD/install/lib:$DYLD_LIBRARY_PATH