diff --git a/MPI/fftw/build-combined b/MPI/fftw/build-combined
new file mode 100755
index 0000000..21163c7
--- /dev/null
+++ b/MPI/fftw/build-combined
@@ -0,0 +1,6 @@
+#!/bin/bash
+
+declare mydir=$(cd $(dirname "${BASH_SOURCE[0]}") && pwd )
+
+./build --use-flags=sp "$@"
+./build --use-flags=dp -f "$@"
diff --git a/MPI/fftw/files/variants b/MPI/fftw/files/variants
index 10ec17c..b217ee7 100644
--- a/MPI/fftw/files/variants
+++ b/MPI/fftw/files/variants
@@ -1,4 +1,4 @@
-fftw/3.3.8	deprecated	gcc/{7.3.0,8.2.0} mpich/3.2.1 openmpi/3.1.3
+fftw/3.3.8		deprecated	gcc/{7.3.0,8.2.0} mpich/3.2.1 openmpi/3.1.3
 # Use older MPI version on merlin5
 fftw/3.3.8-1_sp_merlin	unstable	gcc/8.2.0 mpich/3.2.1 openmpi/3.1.1
 fftw/3.3.8-1_dp_merlin	unstable	gcc/8.2.0 mpich/3.2.1 openmpi/3.1.1
@@ -6,3 +6,4 @@ fftw/3.3.8-1_dp_merlin	unstable	gcc/8.2.0 mpich/3.2.1 openmpi/3.1.1
 fftw/3.3.8-1_sp_merlin6	unstable	gcc/{7.4.0,8.3.0} mpich/3.3 openmpi/3.1.4_merlin6
 fftw/3.3.8-1_dp_merlin6	unstable	gcc/{7.4.0,8.3.0} mpich/3.3 openmpi/3.1.4_merlin6
 
+fftw/3.3.9_merlin6	unstable	gcc/{8.4.0,9.3.0,10.2.0} openmpi/4.0.5-1_slurm