Note that this is fixed in Debian/unstable for flex >= 2.5.4a-13.
-@unnumberedsubsec Python-2.1[.1]
-
-Regular expressions are broken in Python 2.1.[.1], either upgrade or
-downgrade python.
-
@unnumberedsubsec Linux-2.4.0, Guile-1.4 --with-threads
There's a bug in certain kernels around version 2.4.0, that is