Note:
If you see something like this while trying to build a package using musl libc
this kind of fix might also apply for that package!
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freadahead.c: In function 'freadahead':
freadahead.c:83:3: error: #error "Please port gnulib freadahead.c to your platform! Look at the definition of fflush, fread, ungetc on your system, th en report this to bug-gnulib."
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Alejandro Mery
Christian Wiese