Current OS version is 10.11.1.
Current Xcode version is 7.1 (7B91b)
You need GNU make version 3.80 (or newer). On my Mac it is found as
$ make --version
GNU Make 3.81
Copyright (C) 2006 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.
This program built for i386-apple-darwin11.3.0
I downloaded the current version of the libraries from pocoproject.org and moved it to a subdirectory under /Users/robert
$ gunzip poco-1.6.1.tar.gz
$ tar -xf poco-1.6.1.tar
$ cd poco-1.6.1
$ ./configure
$ make -s
$ sudo make -s install