[sqwebmail] make error

[lixiang]

hi,list:         my enviroment:       RH 7.3     qmail-1.0.3     vpopmail-5.3.20  ( ./confiugre --enable-ldap=y --enable-logging=y  --enable-clear-passwd=n)     openldap-2.0.27     expect-5.38     everything is normal, and i want to install sqwebmail-3.3.7.   ./configure   make configure-check   make   and error:   gcc  -I/usr/mailstore-bylix/include -g -O2 -Wall -I.. -I./..  -o authvchkpw  modauthvchkpw.o libauthmod.a libauth.a ../numlib/libnumlib.a ../md5/libmd5.a ../sha1/libsha1.a -L/usr/mailstore-bylix/lib -lvpopmail -L -lldap -llber -lresolv -lm -lcrypt /usr/mailstore-bylix/lib/libvpopmail.a(vauth.o): In function `vauth_getpw': /usr/local/src/vpopmail-5.3.20/vauth.c:87: undefined reference to `ldap_search_s' /usr/local/src/vpopmail-5.3.20/vauth.c:97: undefined reference to `ldap_first_entry' /usr/local/src/vpopmail-5.3.20/vauth.c:102: undefined reference to `ldap_count_entries' .....   i have the correct lib : /usr/lib/libldap.a, and i have installed succesfully qmailadmin-1.0.20 which also require the ldap lib.   any ideas?   thanks advance.