diff --git a/tools/metacall-runtime.sh b/tools/metacall-runtime.sh
index 95e6a0432..b75e1f7a0 100755
--- a/tools/metacall-runtime.sh
+++ b/tools/metacall-runtime.sh
@@ -45,6 +45,15 @@ INSTALL_CLEAN=0
 SHOW_HELP=0
 PROGNAME=$(basename $0)
 
+# Operative System detection
+case "$(uname -s)" in
+	Linux*)		OPERATIVE_SYSTEM=Linux;;
+	Darwin*)	OPERATIVE_SYSTEM=Darwin;;
+	CYGWIN*)	OPERATIVE_SYSTEM=Cygwin;;
+	MINGW*)		OPERATIVE_SYSTEM=MinGW;;
+	*)			OPERATIVE_SYSTEM="Unknown"
+esac
+
 # Check out for sudo
 if [ "`id -u`" = '0' ]; then
 	SUDO_CMD=""