what is difference between libglib libc?

  libc doesn't seem to have any header files , all the POSIX needed files such as string.h unistd.h etc
what are the difference between them?
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libc is a part of the glibc package, which doesn't contain any of the header files. To get the headers you need to have the glibc-devel & possibly glibc-kernheaders packages. Along with the headers in glibc-devel you also get libglib.

The logic here is that one must have the run-time libs (glibc), since most things on a Linux system are linked against libc. But if the system isn't being used for development you don't need the headers, so it makes sense to place them in a separate package.

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