Some damned fool programmers apparently can't tell the difference between upper and lower case. This is annoying because it means that they constantly break compatibility with case-sensitive filesystems.

Most of these idiots started on the Windows platform, which is basically always case insensitive. A few of them started on the Mac OS platform, prior to Mac OS X. One or two of them (particularly those working for a well-known game porting company beginning with the letter "A", and those working for another well-known gaming company beginning with the letter "V") are so aggressively stupid that they refuse to fix their bugs and instead try to claim that it isn't their problem. They may even add code to aggressively stop people from running their software on a case-sensitive filesystem, on the assumption that this is better than fixing their bugs.

libstupid is a library for them. Or rather, to address their wanton idiocy. You use it via dyld interposing, and it replaces a set of path-based functions with modified versions that, on finding that the programmer is an idiot, will search for files with names that differ only in case.

Broadly speaking you do something like this:

DYLD_INSERT_LIBRARIES=

So, perhaps you install libstupid.dylib in /usr/local/lib, after building it with Xcode 4, and then you want to run a program called Foo.app, written by a stupid person. So you start Terminal and enter

DYLD_INSERT_LIBRARIES=/usr/local/lib/libstupid.dylib
/Applications/Foo.app/Contents/MacOS/Foo

A certain piece of software written by the aforementioned company starting with the letter "V", which itself starts with the letter "S", can be run using something like

DYLD_INSERT_LIBRARIES=/usr/local/lib/libstupid.dylib
/Applications/Something.app/Contents/MacOS/something.sh

Then you probably shouldn't run it, and should instead complain at the idiots who are causing you a problem.

There is no help.

Grow up and fix your bugs, and then I'll talk to you. Otherwise, you're too stupid to exist.