diff --git a/make_helpers/utilities.mk b/make_helpers/utilities.mk
index efa0ab9..fcccd24 100644
--- a/make_helpers/utilities.mk
+++ b/make_helpers/utilities.mk
@@ -22,6 +22,13 @@
 escape-shell = '$(subst ','\'',$(1))'
 
 #
+# The grouped-target symbol. Grouped targets are not supported on versions of
+# GNU Make <= 4.2, which was most recently packaged with Ubuntu 20.04.
+#
+
+& := $(if $(filter grouped-target,$(.FEATURES)),&)
+
+#
 # Upper-case a string value.
 #
 # Parameters: