BUG: Looking for python only when OTB_WRAP_PYTHON is enabled

CMakeLists.txt

@@ -101,35 +101,37 @@ reset_qt_i18n_sources()
 
 repository_status(${PROJECT_SOURCE_DIR} OTB_GIT_STATUS_MESSAGE)
 
-# Find python stuff
-# Version 3 is preferred before 2
-if(CMAKE_VERSION VERSION_LESS 3.12.0)
-  set ( Python_ADDITIONAL_VERSIONS "3;2" )
-  set ( PythonInterp_FIND_REQUIRED ${OTB_WRAP_PYTHON} )
-  set ( PythonLibs_FIND_REQUIRED ${OTB_WRAP_PYTHON} )
-  find_package( PythonInterp )
-  if ( OTB_WRAP_PYTHON AND ( "x${PYTHON_VERSION_MAJOR}" STREQUAL "x2" ) )
-      message (WARNING "Python3 not found. There is no longer support of \
-      wrapping in python2 in OTB, but it can still be used.")
-  endif()
-  # Now that we have a python version the addditional versions should only
-  # contain the version we have to get the corresponding libs
-  set (Python_ADDITIONAL_VERSIONS "${PYTHON_VERSION_MAJOR}.${PYTHON_VERSION_MINOR}")
-  find_package ( PythonLibs )
-else()
-  if(WIN32)
-    set(Python_ROOT_DIR "C:/tools/Python37-x64")
-  endif()
-  find_package(Python REQUIRED COMPONENTS Interpreter Development)
-  if(Python_FOUND)
-    message(STATUS "Python Library directory : ${Python_LIBRARY_DIRS}")
-    message(STATUS "Python Headers directory : ${Python_INCLUDE_DIRS}")
-    #For compatibility reason, we have to define these variables
-    set(PYTHON_LIBRARIES ${Python_LIBRARIES})
-    set(PYTHON_INCLUDE_DIR ${Python_INCLUDE_DIRS})
-    set(PYTHON_LIBRARY_DIR ${Python_LIBRARY_DIRS})
-    set(PYTHON_VERSION_STRING ${Python_VERSION})
-    set(PYTHON_EXECUTABLE ${Python_EXECUTABLE})
+if(OTB_WRAP_PYTHON)
+  # Find python stuff
+  # Version 3 is preferred before 2
+  if(CMAKE_VERSION VERSION_LESS 3.12.0)
+    set ( Python_ADDITIONAL_VERSIONS "3;2" )
+    set ( PythonInterp_FIND_REQUIRED ${OTB_WRAP_PYTHON} )
+    set ( PythonLibs_FIND_REQUIRED ${OTB_WRAP_PYTHON} )
+    find_package( PythonInterp )
+    if ( OTB_WRAP_PYTHON AND ( "x${PYTHON_VERSION_MAJOR}" STREQUAL "x2" ) )
+        message (WARNING "Python3 not found. There is no longer support of \
+        wrapping in python2 in OTB, but it can still be used.")
+    endif()
+    # Now that we have a python version the addditional versions should only
+    # contain the version we have to get the corresponding libs
+    set (Python_ADDITIONAL_VERSIONS "${PYTHON_VERSION_MAJOR}.${PYTHON_VERSION_MINOR}")
+    find_package ( PythonLibs )
+  else()
+    if(WIN32)
+      set(Python_ROOT_DIR "C:/tools/Python37-x64")
+    endif()
+    find_package(Python REQUIRED COMPONENTS Interpreter Development)
+    if(Python_FOUND)
+      message(STATUS "Python Library directory : ${Python_LIBRARY_DIRS}")
+      message(STATUS "Python Headers directory : ${Python_INCLUDE_DIRS}")
+      #For compatibility reason, we have to define these variables
+      set(PYTHON_LIBRARIES ${Python_LIBRARIES})
+      set(PYTHON_INCLUDE_DIR ${Python_INCLUDE_DIRS})
+      set(PYTHON_LIBRARY_DIR ${Python_LIBRARY_DIRS})
+      set(PYTHON_VERSION_STRING ${Python_VERSION})
+      set(PYTHON_EXECUTABLE ${Python_EXECUTABLE})
+    endif()
   endif()
 endif()