今天晚上把Apache2.2.4编译了一遍又一遍，颇有味道。若有同好者，请看此文。
- apr.
apr=Apache portable runtime, official website here: http://apr.apache.org
View Informations:
It will show something like this:
apr version informations at: path/to/httpd-src/srclib/apr/include/apr_version.h
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Operating System Information
It will be displayed at error pages, httpd -V informations list.
os info at path/to/httpd-src/os/ -
Apache release
It will be displayed at error pages, httpd -V informations list.
Apache release informations defined at path/to/httpd-src/include/ap_release.h