unless ($define{'USE_ITHREADS'}) {
skip_symbols [qw(
PL_ptr_table
+ PL_op_mutex
Perl_dirp_dup
Perl_cx_dup
Perl_si_dup
Perl_die_nocontext
Perl_deb_nocontext
Perl_form_nocontext
+ Perl_load_module_nocontext
Perl_mess_nocontext
Perl_warn_nocontext
Perl_warner_nocontext