Configuration Error: checking for main in -lmysqlclient

[bisbell]

I'm doing a compile on Solaris 10. I have 2 different versions of MySQL installed on the system. When I set my PATH variable to include the MySQL bin directory of one of them my compile has no problems. When I change my PATH to point to the other installation of MySQL I get the following configuration error.

checking for mysql_config... /opt/webstack/mysql/5.1/bin/mysql_config
checking for main in -lmysqlclient ... no
configure: error: Not found mysqlclient library

The mysqlclient library does exist as /opt/webstack/mysql/5.1/lib/mysql/libmysqlclient.so.16.0.0


The output from the 2 different mysql_config commands are:

Working (PATH includes /opt/coolstack/mysql_32bit/bin)
# mysql_config --libs
-L/opt/coolstack/lib -R/opt/coolstack/lib -L/opt/coolstack/mysql_32bit/lib/mysql -lmysqlclient -R/opt/coolstack/mysql_32bit/lib/mysql -lz -lposix4 -lresolv -lgen -lsocket -lnsl -lm -L/opt/coolstack/lib/ -lssl -lcrypto


Not Working (PATH includes /opt/webstack/mysql/5.1/bin)
# mysql_config --libs
-s -L/opt/webstack/mysql/5.1/lib/mysql -R/opt/webstack/mysql/5.1/lib/mysql -lmysqlclient -lz -lposix4 -lgen -lsocket -lnsl -lm


I'm doing this with a very simple configuration:
# ./configure --prefix=/opt/zabbix --enable-server --enable-agent --with-mysql

Any help would be appreciated.