(Note: the mod_perl apache module uses also this environment variable
for its own purposes and extended its semantics. Refer to the mod_perl
-documentation for more information. Also, spawned threads set this
-variable to the value 2.)
+documentation for more information. Also, spawned threads do the
+equivalent of setting this variable to the value 1.)
If, at the end of a run you get the message I<N scalars leaked>, you can
recompile with C<-DDEBUG_LEAKING_SCALARS>, which will cause