To install dryUp~, drop the entire dryUp~ folder into Pd vanilla's Contents/Resources/extra folder. The provided Macintosh binary should work on any intel Mac.  To build the externs on Linux, cd to Contents/Resources/extra/dryUp~ and:

make dryUp~.pd_linux

If you want to make changes and rebuild on Macintosh:
make dryUp~.pd_darwin