Jay Moseley has this on his web site:
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This includes a description of how Paul Gorlinksy disassembled PTFed objects and retrofitted the changes to the original source code for IFOX to create a new "base" source for IFOX that matched the objects shipped with MVS 3.8J.? You can download the updated materials from the above web page.
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Thanks to Jay Moseley for all the work he has put into MVS community edition and his SYSCPK Compiler Pack of assemblers and compilers for use with MVS 3.8J, TK3, TK4- and TK5.