make cyrus-sasl-2.1.21时出现的错误,那位高手顺便解答一下

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make cyrus-sasl-2.1.21时出现的错误,那位高手顺便解答一下
digestmd5.c: In function `digestmd5_server_mech_step2':
digestmd5.c:2095: warning: dereferencing type-punned pointer will break strict-aliasing rules
digestmd5.c:2112: warning: dereferencing type-punned pointer will break strict-aliasing rules
client.c:863: warning: unused parameter 'rock'
server.c: In function `sasl_setpass':
server.c:152: warning: dereferencing type-punned pointer will break strict-aliasing rules
server.c: In function `sasl_server_start':
server.c:1248: warning: dereferencing type-punned pointer will break strict-aliasing rules
server.c: At top level:
server.c:1914: warning: unused parameter 'rock'
server.c: In function `mysasl_negotiate':
server.c:273: warning: dereferencing type-punned pointer will break strict-aliasing rules
auth_krb5.c: In function `auth_krb5_init':
auth_krb5.c:105: warning: assignment discards qualifiers from pointer target type
auth_krb5.c:106: warning: assignment discards qualifiers from pointer target type
auth_krb5.c: In function `auth_krb5':
auth_krb5.c:404: warning: passing arg 4 of `krb5_get_init_creds_password' discards qualifiers from pointer target type
In file included from auth_pam.c:50:
../config.h:307:1: warning: "PACKAGE" redefined
In file included from mechanisms.h:35,
                 from auth_pam.c:46:
saslauthd.h:166:1: warning: this is the location of the previous definition