diff -r fedd0f957c31 -r a6d8181a8127 make/configure.vm
--- a/make/configure.vm	Tue Aug 13 21:55:10 2019 +0200
+++ b/make/configure.vm	Tue Aug 13 22:03:19 2019 +0200
@@ -317,7 +317,7 @@
 
 # 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