I tried to build libgit2 so I could try to build gitg but encountered

    undefined reference to `qsort_r'

GitHub has a closed issue for this 
https://github.com/libgit2/libgit2/issues/1606 saying that qsort_r was added to 
glibc in version 2.8, released in 2008.

Since libc in Cygwin is part of the base package, how would I find out which 
upstream version it's based on?  

There was a commit in libgit2 that was supposed to fix this :

https://github.com/libgit2/libgit2/commit/0d77647adc1f76df66e437e6442d7f7706e2c38e#diff-bb2cd4651768482b99cb1c52d29ceffdR694

but I don't know enough about Cygwin internals to determine why it still fails 
on Cygwin.

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