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{ lib, mkDerivation, stdenv }:
mkDerivation rec {
path = "usr.bin/rpcgen";
patches = lib.optionals (stdenv.hostPlatform.libc == "glibc") [
# `WUNTRACED` is defined privately `bits/waitflags.h` in glibc.
# But instead of having a regular header guard, it has some silly
# non-modular logic. `stdlib.h` will include it if `sys/wait.h`
# hasn't yet been included (for it would first), and vice versa.
#
# The problem is that with the FreeBSD compat headers, one of
# those headers ends up included other headers...which ends up
# including the other one, this means by the first time we reach
# `#include `<bits/waitflags.h>`, both `_SYS_WAIT_H` and
# `_STDLIB_H` are already defined! Thus, we never ned up including
# `<bits/waitflags.h>` and defining `WUNTRACED`.
#
# This hacks around this by manually including `WUNTRACED` until
# the problem is fixed properly in glibc.
./rpcgen-glibc-hack.patch
];
}
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