Index: zorg/buildbot/builders/ClangLTOBuilder3Stage.py
===================================================================
--- zorg/buildbot/builders/ClangLTOBuilder3Stage.py
+++ zorg/buildbot/builders/ClangLTOBuilder3Stage.py
@@ -74,9 +74,17 @@
     cmake_command = ["cmake"]
     
     if cmake_cache_file:
-        cmake_command += "-C %s" % (" ".join(cmake_cache_file))
+        assert type(cmake_cache_file)==str, \
+            "Please make sure the value assigned to the cmake_cache_file argument is a string type."
+        cmake_command += ['-C %s' % cmake_cache_file]
 
     if extra_cmake_options:
+        assert type(extra_cmake_options)==list, \
+            "Please make sure the value assigned to the extra_cmake_options argument is a list type."
+        for items in extra_cmake_options:
+            assert type(items)==str, \
+            """"Strings are the only acceptable type for items in extra_cmake_options,
+             the value %s was entered and it is %s.""" % (items,type(items))
         cmake_command += extra_cmake_options
 
     cmake_command += [