Extract library directories and include directories for using an OpenSSL installation.
query
libexec
_extract_nids
_extract_nids = (
('grep', "define[\t ]*NID"),
('sed', r"s/#[\t ]*define[ ]*NID_/OPENSSL_NID(/;s/[ ]*[0-9]*$/) \\/"),
)
locate_openssl_object_header
locate_openssl_object_header(executable)
pipe
pipe(object_header)