lib/bio/db/pdb/pdb.rb in bio-1.4.2 vs lib/bio/db/pdb/pdb.rb in bio-1.4.3

@@ -20,13 +20,14 @@
 #
 # = *** CAUTION ***
 # This is beta version. Specs shall be changed frequently.
 #
 
-require 'bio/db/pdb'
 require 'bio/data/aa'
 
 module Bio
+
+  require 'bio/db/pdb' unless const_defined?(:PDB)
 
   # This is the main PDB class which takes care of parsing, annotations
   # and is the entry way to the co-ordinate data held in models.
   #
   # There are many related classes.