From ceee0ec09e1dfd5acb77e6a78242e1b027038a14 Mon Sep 17 00:00:00 2001
From: Roy Ivy III <rivy.dev@gmail.com>
Date: Tue, 7 Apr 2020 22:45:42 -0500
Subject: [PATCH] fix build failure caused by imprecise libc version
 specification

- more precisely describe permissable libc versions

.# [why]

- libc >= v0.2.15 is needed for utmp support.
- libc <= v0.2.66 is required to avoid build errors for MinSRV == 1.31.0.

Intermittant build failures were being caused by `cargo` using early libc versions.
---
 src/uucore/Cargo.toml | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/uucore/Cargo.toml b/src/uucore/Cargo.toml
index 2148eb2d4..5fcd76b20 100644
--- a/src/uucore/Cargo.toml
+++ b/src/uucore/Cargo.toml
@@ -21,7 +21,6 @@ getopts = "<= 0.2.21"
 failure = { version = "<= 0.1.1", optional = true }
 failure_derive = { version = "<= 0.1.1", optional = true }
 time = { version = "<= 0.1.42", optional = true }
-libc = { version = "<= 0.2.66", optional = true }
 wild = "2.0.1"
 nix = { version = "<= 0.13", optional = true }
 lazy_static = { version = "1.3", optional = true }
@@ -31,6 +30,9 @@ platform-info = { version = "<= 0.0.1", optional = true }
 backtrace = ">= 0.3.3, <= 0.3.30"
 # * data-encoding: require 2.1, but 2.2.0 breaks the build for MinSRV 1.31.0
 data-encoding = { version = "~2.1", optional = true }
+# * libc: initial utmp support added in 0.2.15, but 0.2.68 break the build for MinSRV 1.31.0
+libc = { version = "0.2.15, <= 0.2.66", optional = true }
+
 
 [target.'cfg(target_os = "redox")'.dependencies]
 termion = "1.5"