What's the deal with glibc? [closed]

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I know it's a standar c library, but I don't understand why c doesn't have a free library, not one that is lgpl. Is there any such library and if not, than that means every company/particular developer has to buy even the most basic libraries to develop commercial apps ?

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every company/particular developer has to buy even the most basic libraries to develop commercial apps ?

Well, they have to buy (or get for free) the compiler anyway, and libc comes with it.

Also, writing an universal C library is impossible, since exit(), setjmp(), etc. depend on the particular compiler and platform.