@@ -1177,6 +1177,23 @@ Running the Test Suite
substitutes are available for their dependencies (@pxref{Substitutes}).
Some of them require a lot of storage space to hold VM images.
+If you encounter an error like this one:
+
+@example
+Compiling Scheme modules...
+ice-9/eval.scm:142:16: In procedure compile-top-call:
+error: all-system-tests: unbound variable
+hint: Did you forget `(use-modules (gnu tests))'?
+@end example
+
+@noindent
+there may be inconsistency in the work tree from previous builds. Try
+running:
+
+@example
+make clean && make
+@end example
+
Again in case of test failures, please send @email{bug-guix@@gnu.org}
all the details.