haad/proxychains — comment on commit cdec339f112979fef20b288d87e3b071380cf857
File:  line 0
By rofl0r:

there are systems which either don't have pthreads, or installing its headers can be a pain/lot of work/etc (i.e. no root access).
so if you only intend to run single-threaded apps anyway, or don't care about a potential crash in multithreaded apps, you can just undef it and be done. anyway, readability is certainly nicer now.