+
+Implement make-like “eval” function (similar to include directive,
+but it evaluates the output of a function as Goalfile syntax).
+
+Implement make-like “origin” function. This is easy but it requires
+us to track to the origin of definitions which we do not do at
+the moment.
+
+Some kind of “source” directive. If goals sees this then
+it automatically sources the parameter (a shell script) into
+every shell command.