>./miniperl -w -Ilib -MExporter -e 0 || /usr/local/bin/make minitest
>UNRESOLVED EXTERNALS: __builtin_va_start  (LDRERR 512)

>**** EXEC FUNCTION FAILED; subsys =517; info = 48

This indicates that your GNU installation isn't intact. Either
you don't have the GNU provided varargs.h, or the permissions
to that file don't allow you read access and you end up using
the system's varargs.h (which references __builtin_va_start).

Depending on the version of gcc:

gcc -v

you can locate and check the permissions on varargs.h:

ls -l /usr/local/lib/gcc-lib/hppa1.0-hp-mpeix/<vers>/include