tici has a real /tmp

SConstruct

@@ -195,7 +195,7 @@ env = Environment(
   CYTHONCFILESUFFIX=".cpp",
   tools=["default", "cython"]
 )
-  
+
 if os.environ.get('SCONS_CACHE'):
   cache_dir = '/tmp/scons_cache'
 
@@ -209,6 +209,9 @@ if os.environ.get('SCONS_CACHE'):
       if not os.path.isdir(cache_dir_branch) and os.path.isdir(cache_dir):
         shutil.copytree(cache_dir, cache_dir_branch)
       cache_dir = cache_dir_branch
+  elif TICI:
+    cache_dir = '/data/scons_cache'
+
   CacheDir(cache_dir)
 
 node_interval = 5