One module breaking another?

I'm working on a flash module (libswf), and I'm coming across something odd, I have no reason why this is... The module compiles and works fine if I configure like so: ./configure --without-mysql --with-libswf=/root/dist/ However, if I don't exclude mysql then I get the following error: In file included from libmysql.c: m_string.h:165: parse error before '__extension__' m_string.h:165: parse error before '&&' The libswf functions are completely basic, they nothing that should break anything else just basically getting the data from the PHP and passing it to the libswf functions. And the code in mstring.h should certainly not be broken. Why would the MySQL install break like this? Thanks, Sterling