The automake-1.11.2 manual says:
"Scripts can be installed in bindir, sbindir, libexecdir, or pkgdatadir."
and about the pkg dirs it says:
"these are the same as the non-‘pkg’ versions, but with ‘$(PACKAGE)’
Further automake outputs here:
`pkglibexecdir' is not a legitimate directory for `SCRIPTS'
Please explain to me why libexecdir is valid, but pkglibexecdir is not.