diff --git a/Programming/anaconda/2019.07/conda-env-defs/hpce-tools/hpce-tools.yml b/Programming/anaconda/2019.07/conda-env-defs/hpce-tools/hpce-tools.yml
index 2aca8ee80db52137a072f0e2c6559d71dbff77ee..19d540e1f8bc74547c886d164f42e9e458696f1f 100644
--- a/Programming/anaconda/2019.07/conda-env-defs/hpce-tools/hpce-tools.yml
+++ b/Programming/anaconda/2019.07/conda-env-defs/hpce-tools/hpce-tools.yml
@@ -6,4 +6,5 @@ channels:
 dependencies:
   - python=3.6
   - ldapuserdir
-  
+  - cython  # for pyslurm
+  - conda-build