Move eigenpy dependency to main CMakeLists file

CMakeLists.txt

@@ -70,6 +70,10 @@ PROJECT(${PROJECT_NAME} ${PROJECT_ARGS})
 
 add_required_dependency("eigen3 >= 3.0.0")
 
+if (BUILD_PYTHON_INTERFACE)
+  ADD_REQUIRED_DEPENDENCY("eigenpy >= 1.2")
+endif ()
+
 # Add a cache variable to allow not compiling and running tests
 set (RUN_TESTS TRUE CACHE BOOL "compile and run unit tests")
 

python/CMakeLists.txt

@@ -32,8 +32,6 @@
 #  ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 #  POSSIBILITY OF SUCH DAMAGE.
 
-ADD_REQUIRED_DEPENDENCY("eigenpy >= 1.2")
-
 ADD_CUSTOM_TARGET(python)
 SET_TARGET_PROPERTIES(python PROPERTIES EXCLUDE_FROM_DEFAULT_BUILD True)