The Python symtable module depends on .h files that setup.py doesn't track.
diff --git a/Modules/Setup.dist b/Modules/Setup.dist
index 61afe8c..f54b13b 100644
--- a/Modules/Setup.dist
+++ b/Modules/Setup.dist
@@ -110,6 +110,9 @@
 
 # ======================================================================
 
+# The Python symtable module depends on .h files that setup.py doesn't track
+_symtable symtablemodule.c
+
 # The SGI specific GL module:
 
 GLHACK=-Dclear=__GLclear