GH #54, PR #55 - Fix slave pty reopening on Solaris/illumos. After close_slave(), reopening with plain Perl open() skipped pushing STREAMS modules (ptem, ldterm, ttcompat), causing isatty() to return false. Added _open_tty() XS function that opens the device and pushes STREAMS modules on platforms that support I_PUSH.
GH #56, PR #58 - Fix undef warnings on Perl 5.8.8 by removing the undef operator on localized $SIG{__DIE__}, and fix XS ttyname() on older Perls by avoiding the InOutStream typemap which can return NULL for filehandles created via new_from_fd.
GH #57, PR #59 - Add __BSD_VISIBLE for FreeBSD in function probes. The _XOPEN_SOURCE definition hid BSD extensions like strlcpy, causing probe failures and subsequent compile errors from conflicting static/non-static declarations.
Maintenance:
PR #60 - Modernize Makefile.PL: replace BUILD_REQUIRES with TEST_REQUIRES (EUMM 6.64+), add CONFIGURE_REQUIRES, upgrade META_MERGE to meta-spec v2, modernize generated Constant.pm to use 'our' instead of 'use vars', and remove dead PPD postamble.