diff --git a/CMakeLists.txt b/CMakeLists.txt
index 31449ec..b312f73 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,9 @@
 cmake_minimum_required(VERSION 2.8.12)
 project(cmake_example)
 
+include_directories(${cmake_example_SOURCE_DIR}/arugula)
+add_subdirectory(arugula)
 add_subdirectory(pybind11)
-pybind11_add_module(cmake_example src/main.cpp)
+
+pybind11_add_module(cmake_example src/main.cpp MODULE)
+target_link_libraries(cmake_example PUBLIC arugula)
diff --git a/arugula/CMakeLists.txt b/arugula/CMakeLists.txt
new file mode 100644
index 0000000..59b42e5
--- /dev/null
+++ b/arugula/CMakeLists.txt
@@ -0,0 +1,6 @@
+set(ARUGULA_HEADER_FILES arugula.h)
+
+add_library(arugula SHARED arugula.cpp ${ARUGULA_HEADER_FILES})
+
+install(TARGETS arugula LIBRARY DESTINATION lib)
+install(FILES ${ARUGULA_HEADER_FILES} DESTINATION include/arugula)
diff --git a/arugula/arugula.cpp b/arugula/arugula.cpp
new file mode 100644
index 0000000..6ccef75
--- /dev/null
+++ b/arugula/arugula.cpp
@@ -0,0 +1,9 @@
+#include "arugula.h"
+
+// test shared lib
+
+int 
+test_func()
+{
+    return 13;
+}
diff --git a/arugula/arugula.h b/arugula/arugula.h
new file mode 100644
index 0000000..77722f1
--- /dev/null
+++ b/arugula/arugula.h
@@ -0,0 +1 @@
+int test_func();
diff --git a/setup.py b/setup.py
index 7db697f..d853154 100644
--- a/setup.py
+++ b/setup.py
@@ -33,6 +33,11 @@ def run(self):
 
     def build_extension(self, ext):
         extdir = os.path.abspath(os.path.dirname(self.get_ext_fullpath(ext.name)))
+
+        # from cmake_example PR #16
+        if not extdir.endswith(os.path.sep):
+            extdir += os.path.sep
+
         cmake_args = ['-DCMAKE_LIBRARY_OUTPUT_DIRECTORY=' + extdir,
                       '-DPYTHON_EXECUTABLE=' + sys.executable]
 
diff --git a/src/main.cpp b/src/main.cpp
index 86ab582..b1f2722 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,5 +1,7 @@
 #include <pybind11/pybind11.h>
 
+#include "arugula.h"
+
 int add(int i, int j) {
     return i + j;
 }
@@ -32,6 +34,8 @@ PYBIND11_MODULE(cmake_example, m) {
         Some other explanation about the subtract function.
     )pbdoc");
 
+    m.def("test_func", [] () { return test_func(); });
+
 #ifdef VERSION_INFO
     m.attr("__version__") = VERSION_INFO;
 #else