--- a/configure	Tue Aug 13 21:55:10 2019 +0200
+++ b/configure	Tue Aug 13 22:03:19 2019 +0200
@@ -232,7 +232,7 @@
 
 # Toolchain detection
 # this will insert make vars to config.mk
-source make/toolchain.sh
+. make/toolchain.sh
 
 # add user specified flags to config.mk
 echo >> $TEMP_DIR/config.mk