help in configuring php with mysql

hi i used redcarpet to install mysql in my system. it installed well. but the configuration probs occured in the dependencies .when i checked if mysql is installed well using a pgm in php(just to connect to a db) it says "mysql_connect()/mysql_pconnect() - called a unidentified function" doesn't redcarpet take care of this configuration with php? which is generally done using ./configure --with-apache=../.... --with-mysql=/usr/bin/mysql prefix=/usr/local/php4 but when i do this in shell it says some header files r not found in the dir /usr/bin/mysql also i tried with the dir /usr/include/mysql plz help me out tnx prasad