diff --git a/config/build_olcf_summit.sh b/config/build_olcf_summit.sh
index 06d10da1d2..76f651697d 100755
--- a/config/build_olcf_summit.sh
+++ b/config/build_olcf_summit.sh
@@ -4,10 +4,11 @@ echo "Purging current module set"
 
 . config/load_summit_modules.sh
 
-declare -A builds=( ["cpu"]=" " \
-                    ["complex_cpu"]="-DQMC_COMPLEX=1 " \
+declare -A builds=( ["cpu"]="-DENABLE_MASS=1 -DMASS_ROOT=/sw/summit/xl/16.1.1-5/xlmass/9.1.1" \
+                    ["complex_cpu"]="-DQMC_COMPLEX=1 -DENABLE_MASS=1 -DMASS_ROOT=/sw/summit/xl/16.1.1-5/xlmass/9.1.1" \
                     ["legacy_gpu"]="-DQMC_CUDA=1 -DCUDA_ARCH=sm_70 " \
-		    ["complex_legacy_gpu"]="-DQMC_CUDA=1 -DQMC_COMPLEX=1 -DCUDA_ARCH=sm_70 " )
+		    ["complex_legacy_gpu"]="-DQMC_CUDA=1 -DQMC_COMPLEX=1 -DCUDA_ARCH=sm_70 " \
+		    ["enable_cuda"]="-DENABLE_CUDA=1 -DENABLE_MASS=1 -DMASS_ROOT=/sw/summit/xl/16.1.1-5/xlmass/9.1.1")
 
 mkdir bin
 
diff --git a/config/load_summit_modules.sh b/config/load_summit_modules.sh
index 6348debc05..7756eddbb6 100644
--- a/config/load_summit_modules.sh
+++ b/config/load_summit_modules.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 echo "Loading QMCPACK dependency modules for summit"
-module load gcc
+module load gcc/7.4.0
 module load spectrum-mpi
 module load essl
 module load netlib-lapack