Compilation failure with glibc 2.28

[andrewshyichuk]

I am trying to compile m4 as a part of Global Arrays, http://hpc.pnl.gov/globalarrays/.
The autogen.sh script downloads and compiles m4-1.4.17. I tried 1.4.18 - the same problem, namely:

While compiling freadahead.c, the error shows up:

freadahead.c: In function 'freadahead':
freadahead.c:92:3: error: #error "Please port gnulib freadahead.c to your platform! Look at the definition of fflush, fread, ungetc on your system, then report this to bug-gnulib."
#error "Please port gnulib freadahead.c to your platform! Look at the definition of fflush, fread, ungetc on your system, then report this to bug-gnulib."
^~~~~
I have it in Manjaro, updated 17.12.2018, kernel 4.14, x86_64, AMD Ryzen, but it looks like the problem is related to glibc 2.28, e.g.:
https://bugzilla.redhat.com/show_bug.cgi?id=1595702
sifive/freedom-u-sdk#74

[cirosantilli]

Fixed by buildroot/buildroot@c48f8a6 which went into 2018.08. Found with git log master -- package/m4.