diff --git a/Makefile b/Makefile
new file mode 100644
index 00000000..1e56cb28
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,2 @@
+prepare_apptainer_env:
+	cd envs && ./build_singularity.sh
diff --git a/envs/build_singularity.sh b/envs/build_singularity.sh
old mode 100644
new mode 100755
index 86e053fd..c0c3d936
--- a/envs/build_singularity.sh
+++ b/envs/build_singularity.sh
@@ -1,9 +1,5 @@
-#!/bin/bash
-
-sudo singularity build sklearn.sif sklearn_singularity.def
-
-sudo singularity build clustbench.sif clustbench_singularity.def
-
-sudo singularity build r.sif r_singularity.def
-
-sudo singularity build fcps.sif fcps_singularity.def
+#!/bin/sh
+singularity build sklearn.sif sklearn_singularity.def
+singularity build clustbench.sif clustbench_singularity.def
+singularity build r.sif r_singularity.def
+singularity build fcps.sif fcps_singularity.def