Cassowary/C++ needs to be compiled using a modern C++ compiler.
At one time or another, it has compiled using:
  o egcs-1.0.1, egcs-1.0.3, egcs-1.1b, gcc-2.8.1, gcc-2.95.2
  o Visual C++ 5.0

Cassowary/Java was developed using Sun's JDK-1.1.3, ported to Linux
More recent versions should work fine, and it has been tested
with JDK-1.2pre2.

The included Makefiles depend upon features of GNU Make.  See:

ftp://ftp.gnu.org/pub/gnu/

for a version that you can build.


To build the c++/qdemos/QuadDemo application, you'll need TrollTech's Qt
widget set for X11, available from:

http://www.troll.no/dl/qtfree-dl.html


See also the Scwm (Scheme Constraints Window Manager) web page for a use 
of Cassowary in a substantial application:

http://scwm.mit.edu/scwm/