unthreaded perl58 builds fine, but:

`sh  cflags "optimize='-O2'" pp_sys.o` -DPIC -fPIC pp_sys.c
          CCCMD =  gcc -DPERL_CORE -c -fno-strict-aliasing -I/usr/pkg/include -O2  -Wall
pp_sys.c: In function `Perl_pp_gprotoent':
pp_sys.c:4888: warning: implicit declaration of function `getprotobyname_r'
pp_sys.c:4896: warning: implicit declaration of function `getprotobynumber_r'
pp_sys.c:4903: warning: implicit declaration of function `getprotoent_r'
pp_sys.c: In function `Perl_pp_gservent':
pp_sys.c:4980: warning: implicit declaration of function `getservbyname_r'
pp_sys.c:4996: warning: implicit declaration of function `getservbyport_r'
pp_sys.c:5003: warning: implicit declaration of function `getservent_r'
pp_sys.c: In function `Perl_pp_sprotoent':
pp_sys.c:5076: warning: implicit declaration of function `setprotoent_r'
pp_sys.c:5076: error: structure has no member named `_protoent_data'
pp_sys.c: In function `Perl_pp_sservent':
pp_sys.c:5087: warning: implicit declaration of function `setservent_r'
pp_sys.c:5087: error: structure has no member named `_servent_data'
pp_sys.c: In function `Perl_pp_eprotoent':
pp_sys.c:5122: warning: implicit declaration of function `endprotoent_r'
pp_sys.c:5122: error: structure has no member named `_protoent_data'
pp_sys.c: In function `Perl_pp_eservent':
pp_sys.c:5134: warning: implicit declaration of function `endservent_r'
pp_sys.c:5134: error: structure has no member named `_servent_data'
*** Error code 1

Stop.

-- 
Jeff Rizzo                                         http://boogers.sf.ca.us/~riz