make warnings (prototype compatability) a problem?

Newbie compiling question here.  While compiling php, we are getting lots
of warnings from about every --with-xxx library we are compiling in, such
as:

	warning: argument #1 is incompatible with prototype
AND
	initialization type mismatch

These mostly seem to be discrepancies between files in the php source tree
and the installed support library header files.

My question is, generally, are these things to worry about?  Will it
cause strange problems while PHP is running?

I can provide exact module lists/gmake output if need be, but it's
happening a lot and I don't want to include it unless asked.

thanks!

ivo
goop AT scs DOT unr DOT edu