configure warns of problems with assert.h

[khaledblah]

During the configure process this problem occurs on my Ubuntu 11.04 machine (amd64) GCC 4.5

checking assert.h usability... no
checking assert.h presence... yes
configure: WARNING: assert.h: present but cannot be compiled
configure: WARNING: assert.h:     check for missing prerequisite headers?
configure: WARNING: assert.h: see the Autoconf documentation
configure: WARNING: assert.h:     section "Present But Cannot Be Compiled"
configure: WARNING: assert.h: proceeding with the compiler's result
configure: WARNING:     ## ------------------------------------------------------ ##
configure: WARNING:     ## Report this to http://github.com/posulliv/libcassandra ##
configure: WARNING:     ## ------------------------------------------------------ ##
checking for assert.h... no