diff --git a/CMLibBreathe.cmake b/CMLibBreathe.cmake
index 5b4cef9..47ee9a1 100644
--- a/CMLibBreathe.cmake
+++ b/CMLibBreathe.cmake
@@ -6,12 +6,14 @@ if(BUILD_BREATHE_DOC STREQUAL AUTO)
   find_package(Perl)
   set(Python_ADDITIONAL_VERSIONS 3.7 3.6 3.5 3.4 3.3 3.2)
   find_package(PythonInterp)
-  find_package(Sphinx)
-  include(FindPythonModule)
-  find_python_module(breathe)
-  find_python_module(recommonmark)
-  if(DOXYGEN_FOUND AND PERL_FOUND AND SPHINX_FOUND AND breathe AND recommonmark)
-    set(BUILD_BREATHE_DOC ON CACHE STRING "Enable documntation in Breathe format" FORCE)
+  if (PYTHONINTERP_FOUND)
+    find_package(Sphinx)
+    include(FindPythonModule)
+    find_python_module(breathe)
+    find_python_module(recommonmark)
+    if(DOXYGEN_FOUND AND PERL_FOUND AND PYTHONINTERP_FOUND AND SPHINX_FOUND AND breathe AND recommonmark)
+      set(BUILD_BREATHE_DOC ON CACHE STRING "Enable documntation in Breathe format" FORCE)
+    endif()
   endif()
 elseif(BUILD_BREATHE_DOC)
   find_package(Doxygen REQUIRED)