[CMake] add INSTALL_PYTHON_INTERFACE_ONLY option

CMakeLists.txt

@@ -32,6 +32,8 @@ ENDIF(CURVES_WITH_PINOCCHIO_SUPPORT)
 SET(BOOST_COMPONENTS unit_test_framework serialization)
 
 OPTION (BUILD_PYTHON_INTERFACE "Build the python binding" ON)
+OPTION (INSTALL_PYTHON_INTERFACE_ONLY "Install *ONLY* the python bindings" OFF)
+
 IF(BUILD_PYTHON_INTERFACE)
   FINDPYTHON()
   INCLUDE_DIRECTORIES(SYSTEM ${PYTHON_INCLUDE_DIRS})
@@ -52,5 +54,8 @@ IF(BUILD_PYTHON_INTERFACE)
   ADD_SUBDIRECTORY(python)
 ENDIF(BUILD_PYTHON_INTERFACE)
 
-ADD_SUBDIRECTORY(include/curves)
+IF(NOT INSTALL_PYTHON_INTERFACE_ONLY)
+  ADD_SUBDIRECTORY(include/curves)
+ENDIF(NOT INSTALL_PYTHON_INTERFACE_ONLY)
+
 ADD_SUBDIRECTORY(tests)