Apache2.2.9 出现 configure的时候出错

在AIX 5.3安装Apache2.2.9 , configure的时候出错

./configure --prefix=/usr/local/apache2的时候

checking pthread.h presence... yes
configure: WARNING: pthread.h: present but cannot be compiled
configure: WARNING: pthread.h:     check for missing prerequisite headers?
configure: WARNING: pthread.h: see the Autoconf documentation
configure: WARNING: pthread.h:     section "Present But Cannot Be Compiled"
configure: WARNING: pthread.h: proceeding with the preprocessor's result
configure: WARNING: pthread.h: in the future, the compiler will take precedence

怎么办呢?