diff --git a/OpenMP_gpu/adv/multi_gpu/README_multi_gpu.md b/OpenMP_gpu/adv/multi_gpu/README_multi_gpu.md
index ff24ac9..f55b8e1 100644
--- a/OpenMP_gpu/adv/multi_gpu/README_multi_gpu.md
+++ b/OpenMP_gpu/adv/multi_gpu/README_multi_gpu.md
@@ -4,6 +4,13 @@
 On multi-device nodes, you can specify a device to
 perform the offload to, with the device clause.
 
+LUMI:
+IT IS IMPORTANT to allow use of 4 GPUs in the job scripts
+(or interacctive usage with:
+```
+    --gres=gpu:mi250:1
+```
+
 ## Exercises
 
 1.) Look over the code.
diff --git a/OpenMP_gpu/adv/time_add/Makefile b/OpenMP_gpu/adv/time_add/Makefile
index 2e2deee..3da60c4 100644
--- a/OpenMP_gpu/adv/time_add/Makefile
+++ b/OpenMP_gpu/adv/time_add/Makefile
@@ -1,21 +1,33 @@
 #NVCC   = nvcc
 #CFLAGS = -O2
 
-CPP=clang++
-OMP_FLAG=-fopenmp
- OMP_OFF=-fopenmp-targets=nvptx64
- CCFLAGS=-O2
+#TACC LS6 (clang++ 16)
+ifneq ("$(TACC_SYSTEM)","")
+   ifeq ($(TACC_SYSTEM),ls6)
+     ifeq ($(shell clang++ -v 2>&1 | grep -c "clang version"), 1)
+         CC       =  clang++
+         CCFLAGS  = -O2
+         OMP_FLAG = -fopenmp
+         OMP_OFF  = -fopenmp-targets=nvptx64
+      endif
+   endif
+endif
 
-#CPP=clang++
-#OMP_FLAG=-fopenmp
-# OMP_OFF=
-# CCFLAGS=-O2
+#LUMI
+ifneq ("$(LUMI_LMOD_FAMILY_PRGENV)","")
+ CC       =  CC
+ CCFLAGS  = -O2
+ OMP_FLAG = -fopenmp
+ OMP_OFF  =
+endif
 
 
 add_c: add.o
-	$(CPP)    -o $@ $(OMP_FLAG) $(OMP_OFF) add.o
+	$(CC)    -o $@ $(OMP_FLAG) $(OMP_OFF) add.o $(PIE)
 add.o: add.cpp
-	$(CPP) -c -o $@ $(OMP_FLAG) $(OMP_OFF) $? $(CCFLAGS)
+	$(CC) -c -o $@ $(OMP_FLAG) $(OMP_OFF) $? $(CCFLAGS) $(PIE)
 
 clean:
 	rm -f add_c *.o
+#https://www.gnu.org/software/make/manual/html_node/index.html#SEC_Contents
+#https://stackoverflow.com/questions/5188267/checking-the-gcc-version-in-a-makefile
diff --git a/OpenMP_gpu/job_cpu b/OpenMP_gpu/job_cpu
index a1d28ad..03f0d46 100644
--- a/OpenMP_gpu/job_cpu
+++ b/OpenMP_gpu/job_cpu
@@ -1,5 +1,5 @@
 #!/bin/bash -l
-#SBATCH -J basic_c        # Job name
+#SBATCH -J omp_cpu        # Job name
 #SBATCH -o %x.o%j         # Name of stdout & stderr file
 #SBATCH -p debug          # Partition (queue) name
 #SBATCH -N 1              # one node
diff --git a/OpenMP_gpu/job_gpu b/OpenMP_gpu/job_gpu
index c8b53d9..9d069a0 100644
--- a/OpenMP_gpu/job_gpu
+++ b/OpenMP_gpu/job_gpu
@@ -1,6 +1,6 @@
 #!/bin/bash -l
-#SBATCH -J basic_g        # Job name
-#SBATCH -o %x.out%j         # Name of stdout & stderr file
+#SBATCH -J omp_gpu        # Job name
+#SBATCH -o %x.out%j       # Name of stdout & stderr file
 #SBATCH -p dev-g          # Partition (queue) name
 #SBATCH -N 1              # one node
 #SBATCH -n 1              # tasks