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Various portability issues, mainly between linux/freebsd

== prctl() / prctl.h ==

No prctl() in freebsd. 

* To set process title, use setproctitle()
* For PR_SET_PTRACER, I'm not sure now.

== malloc.h ==

Including malloc.h in freebsd leads to compile error. Use stdlib.h instead.

Anyway, in linux's malloc(3) manpage, it is said that you should include stdlib.h.

== libdl ==

In linux, dlopen()/dlclose()/dlsym() are in libdl. In freebsd, they are in libc. So there is no point to link with libdl, and there is no libdl, anyway.

== program_invocation_short_name ==

No such thing in bsd. Maybe you should use argv[0].

== Include path / Lib path ==

freebsd installs all non-base softwares into '''/usr/local'''. So, the third party include files are in '''/usr/local/include''', and third party lib files are in '''/usr/local/lib''', and they are not in the default include/lib path, so you should include them with -I & -L.

The modern way is to use pkg-config. You may also use cmake's FindXXX.