Author: Michael R. Crusoe <crusoe@ucdavis.edu>
Description: Try the older rdflib
--- cwltool.orig/setup.py
+++ cwltool/setup.py
@@ -33,7 +33,7 @@
       install_requires=[
           'requests',
           'PyYAML',
-          'rdflib >= 4.2.0',
+          'rdflib >= 4.1.0',
           'rdflib-jsonld >= 0.3.0',
           'shellescape',
           'schema_salad == 1.6.20160202222448'
