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ffi gem install error

error: implicit declaration

$ gem install ffi
.
.
.
error: implicit declaration of function 'rb_thread_call_without_gvl' is invalid

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Default Bundler

remove it first

$ gem info bundler

if you have an older version listed as default, older than what is being asked for try removing the default (you will need to change the file path based on the version

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ICU4C

Node v10 was requiring icu4c v 64, I lost my version of 64 from brew cleaning up, brew install icu4c@64 doesn't work. Using the sha for the Formula for version 64 brew install https://raw.githubusercontent.com/Homebrew/homebrew-core/a806a621ed3722fb580a58000fb274a2f2d86a6d/Formula/icu4c.rb said that version 64 was installed

icu4c: stable 67.1 (bottled) [keg-only]
C/C++ and Java libraries for Unicode and globalization
http://site.icu-project.org/home

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Use either of the following commands to delete all empty lines:

:g/^$/d
:v/./d

If you want to delete all lines that are empty or that contain only whitespace characters (spaces, tabs), use either of:

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[
  {
    "event": "send",
    "msg": {
      "ts": 1365109999,
      "subject": "This an example webhook message",
      "email": "[email protected]",
      "sender": "[email protected]",
      "tags": [
        "webhook-example"

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Examine the binary logs to decide up to where you want to delete to:

$ ls -la /usr/local/var/mysql

-rw-rw----  1 mysql mysql   104871967 Aug 24 00:01 BINLOG.015687
-rw-rw----  1 mysql mysql   104885618 Aug 24 00:04 BINLOG.015688
-rw-rw---- 1 mysql mysql 104866713 Aug 24 00:06 BINLOG.015689

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to re-enable boot chime

$ sudo nvram BootAudio=%01

to disable boot chime

$ sudo nvram BootAudio=%00

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Check your version

$ bash --version
GNU bash, version 3.2.57(1)-release (x86_64-apple-darwin18)
Copyright (C) 2007 Free Software Foundation, Inc.

Install newer from homebrew

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require 'tabulo'
require 'rainbow'

Rails.application.eager_load!
unused_routes = {}

# Iterating over all non-empty routes from RouteSet
Rails.application.routes.routes.map(&:requirements).reject(&:empty?).each do |route|
  name = route[:controller].camelcase
  next if name.start_with?("Rails")

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# `ERROR:  Error installing nokogiri:
# ERROR: Failed to build gem native extension.
# 
#   current directory: /usr/local/var/rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/nokogiri-1.7.0/ext/nokogiri
# /usr/local/var/rbenv/versions/2.3.1/bin/ruby -r ./siteconf20170103-68488-r71c9j.rb extconf.rb --with-xml=/usr/local/Cellar/libxml2/ --use-system-libraries
# checking if the C compiler accepts ... yes
# checking if the C compiler accepts -Wno-error=unused-command-line-argument-hard-error-in-future... no
# Building nokogiri using system libraries.
# ERROR: cannot discover where libxml2 is located on your system. please make sure `pkg-config` is installed.
# *** extconf.rb failed ***