Trying to compile nagios plugins on an x86_64 box as i have non standard locations for some software and coming accross this issue. The plugins compile OK but the check_mysql plugin fails to compile and i see this error in the compile log

configure:9368: checking for mysql_init in -lmysqlclient configure:9398: gcc -o conftest -g -O2 -I/opt/mysql/include -L. conftest.c -lmysqlclient -L/opt/mysql/lib -lz >&5 /usr/bin/ld: skipping incompatible /opt/mysql/lib/libmysqlclient.a when searching for -lmysqlclient /usr/bin/ld: cannot find -lmysqlclient | char mysql_init (); | mysql_init (); configure:9436: checking for mysql_close in -lmysqlclient configure:9466: gcc -o conftest -g -O2 -I/opt/mysql/include -L. conftest.c -lmysqlclient >&5 /usr/bin/ld: cannot find -lmysqlclient | char mysql_close (); | mysql_close (); configure:10217: WARNING: Skipping mysql plugin

any ideas about this as i have to compile these myself - Mysql is being found and does run so any ideas would be great. Tne nagios list has drawn a blank so far.

It doesn't seem to like your mysql, as it lists it as incompatible. As a side note, I have to ask why you built mysql in /opt. If it's to get mysql5 support, rpms for that exist for centos, and don't require rebuilds of anything else. It's situations like the one you're in that make package management a worth time investment, doesn't matter if it's .deb, rpm or even emerge or whatever gentoo calls it.

-- "They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety'' Benjamin Franklin 1775