I just want to write about a error message people see when they try to force a program to use a different library. Sometimes that's nescessary, because you want to ensure that an application uses a certain variant of your shared library or you want to use preload a library implementing a system call in a more efficient manner. One example is the improved, multi-thread enabled memory allocator libumem. But somehow you don't get additional performance but just the error/warning message open failed: No such file in secure directories.

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