(This file public domain.) The basic Asymptote (home page: http://asymptote.sf.net) sources are included in the TL sources. We also include a number of Windows dll's for Asymptote (and nothing else). Sources for cygwin 32-bit: https://cygwin.com/snapshots/x86/cygwin-20171219-src.tar.xz Sources for cygwin 64-bit: ttps://cygwin.com/snapshots/x86_64/cygwin-20170823-src.tar.xz Sources for freeglut.dll: http://prdownloads.sourceforge.net/freeglut/freeglut-2.8.1.tar.gz The README in the Asymptote sources has more information.