What I've heard is SCO does not have libdl or some equivalent. So, no dlopen library function. SCO still has some sort of dynamic linking, just not that kind.

Took me a moment to understand that dirty trick with the library directory, and yeah, that's pretty cool, sneaky, and dirty. The crucial point is that the length of the directory name is kept the same by padding the front of the name with the correct number of '/' characters. Sort of the NOP of directory names.