spec for apache modules

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hello, i have just made spec for apache-mod_ & apache-mod_auth_mysql,
and they are buildable, but:

Cannot load /usr/lib/apache/mod_auth_mysql.so into server:
/usr/lib/apache/mod_auth_mysql.so: undefined symbol: mysql_store_result

so - why in pld this symbols are undefined, when i am building
packages without spec file, everything is ok...?

what is the best way to solve this problem, could you
please tell me with real example?

thanks -
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