Work on detection of python libs from python interp

Author: Roberto Di Remigio

CMakeLists.txt

@@ -45,7 +45,37 @@ FortranCInterface_VERIFY(CXX)
 init_FCMangle()
 
 find_package(PythonInterp REQUIRED)
-find_package(PythonLibs   REQUIRED)
+# Set variables to help find Python library that is compatible with interpreter
+# Copied from https://bitbucket.org/fenics-project/dolfin
+if (PYTHONINTERP_FOUND)
+  # Get Python include path from Python interpretter
+  execute_process(COMMAND "${PYTHON_EXECUTABLE}" -c
+                         "import distutils.sysconfig, sys; sys.stdout.write(distutils.sysconfig.get_python_inc())"
+                  OUTPUT_VARIABLE _PYTHON_INCLUDE_PATH
+                  RESULT_VARIABLE _PYTHON_INCLUDE_RESULT)
+
+  # Get Python library path from interpreter
+  execute_process(COMMAND "${PYTHON_EXECUTABLE}" -c
+                        "import os, sys, inspect; sys.stdout.write(os.path.split(os.path.split(inspect.getfile(inspect))[0])[0])"
+                  OUTPUT_VARIABLE _PYTHON_LIB_PATH
+                  RESULT_VARIABLE _PYTHON_LIB_RESULT)
+
+  # Set include path, if returned by interpreter
+  if ("${_PYTHON_INCLUDE_RESULT}" STREQUAL "0")
+    set(PYTHON_INCLUDE_DIR ${_PYTHON_INCLUDE_PATH})
+  endif()
+
+  # Add a search path for Python library based on output from
+  # interpreter
+  set(CMAKE_LIBRARY_PATH_SAVE ${CMAKE_LIBRARY_PATH})
+  if ("${_PYTHON_LIB_RESULT}" STREQUAL "0")
+    set(CMAKE_LIBRARY_PATH ${_PYTHON_LIB_PATH})
+  endif()
+
+  # Find Pythons libs
+  find_package(PythonLibs ${PYTHON_VERSION_STRING} EXACT REQUIRED)
+  #set(CMAKE_LIBRARY_PATH ${CMAKE_LIBRARY_PATH_SAVE})
+endif()
 find_package(ZLIB         REQUIRED) 
 
 if(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)