如何解决这个编译mod_perl时出现的错误？

checking dynamic linker characteristics... freebsd4.9 ld.so
configure: error: tag name "CXX" already exists
gmake: *** [config.status] Error 1
*** Error code 2

Stop in /usr/ports/net/linc.
*** Error code 1

Stop in /usr/ports/archivers/fileroller.
*** Error code 1

Stop in /usr/ports/archivers.
*** Error code 1

Stop in /usr/ports.
*** Error code 1

Stop in /usr/ports/www/mod_perl.

系统：4.9　安装方法：通过ports进行安装
apache:apache+ssl