gnu: Add gdc-client.

* gnu/packages/bioinformatics.scm (gdc-client): New variable.

gnu/packages/bioinformatics.scm

@@ -7841,6 +7841,46 @@ includes software to
 ")
       (license license:cc0))))
 
+(define-public gdc-client
+  (package
+    (name "gdc-client")
+    (version "1.6.0")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://github.com/NCI-GDC/gdc-client.git")
+             (commit version)))
+       (file-name (git-file-name name version))
+       (sha256
+        (base32
+         "0cagawlzjwj3wam10lv64xgbfx4zcnzxi5sjpsdhq7rn4z24mzc2"))))
+    (build-system python-build-system)
+    (arguments
+     `(#:phases
+       (modify-phases %standard-phases
+         (add-after 'unpack 'relax-requirements
+           (lambda _
+             (substitute* "requirements.txt"
+               (("==") ">=")))))))
+    (inputs
+     `(("python-cryptography" ,python-cryptography)
+       ("python-intervaltree" ,python-intervaltree)
+       ("python-jsonschema" ,python-jsonschema)
+       ("python-lxml" ,python-lxml)
+       ("python-ndg-httpsclient" ,python-ndg-httpsclient)
+       ("python-progressbar2" ,python-progressbar2)
+       ("python-pyasn1" ,python-pyasn1)
+       ("python-pyopenssl" ,python-pyopenssl)
+       ("python-pyyaml" ,python-pyyaml)
+       ("python-requests" ,python-requests)
+       ("python-termcolor" ,python-termcolor)))
+    (home-page "https://gdc.nci.nih.gov/access-data/gdc-data-transfer-tool")
+    (synopsis "GDC data transfer tool")
+    (description "The gdc-client provides several convenience functions over
+the GDC API which provides general download/upload via HTTPS.")
+    (license license:asl2.0)))
+
 (define-public vsearch
   (package
     (name "vsearch")