railsでunicornのインストールにコケる

Question

タイトルの通りです...
ググっても出て来ず。おたすけください。

以下ソース。

.
.

group :production, :staging do
  gem 'unicorn'
end

.
.
.

$ bundle install
.
.
.
.
Installing kgio 2.11.2 with native extensions
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

    current directory: /Users/xxxxx/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/kgio-2.11.2/ext/kgio
/Users/xxxxx/.rbenv/versions/2.5.3/bin/ruby -r ./siteconf20190724-35130-1txhwix.rb extconf.rb
checking for CLOCK_MONOTONIC in time.h... yes
checking for clockid_t in time.h... yes
checking for clock_gettime() in -lrt... no
checking for t_open() in -lnsl... no
checking for socket() in -lsocket... no
checking for poll() in poll.h... yes
checking for getaddrinfo() in sys/types.h,sys/socket.h,netdb.h... yes
checking for getnameinfo() in sys/types.h,sys/socket.h,netdb.h... yes
checking for struct sockaddr_storage in sys/types.h,sys/socket.h... yes
checking for accept4() in sys/socket.h... no
checking for sys/select.h... yes
checking for writev() in sys/uio.h... yes
checking for ruby/io.h... yes
checking for rb_io_t.fd in ruby.h,ruby/io.h... yes
checking for rb_io_t.mode in ruby.h,ruby/io.h... yes
checking for rb_io_t.pathv in ruby.h,ruby/io.h... yes
checking for struct RFile in ruby.h,ruby/io.h... yes
checking size of struct RFile in ruby.h,ruby/io.h... 24
checking for struct RObject... yes
checking size of struct RObject... 40
checking size of int... 4
checking for rb_io_ascii8bit_binmode()... yes
checking for rb_update_max_fd()... yes
checking for rb_fd_fix_cloexec()... yes
checking for rb_cloexec_open()... yes
checking for ruby/thread.h... yes
checking for rb_thread_call_without_gvl() in ruby/thread.h... yes
checking for rb_thread_blocking_region()... no
checking for rb_thread_io_blocking_region()... yes
checking for rb_str_set_len()... yes
checking for rb_hash_clear() in ruby.h... yes
checking for rb_time_interval()... yes
checking for rb_wait_for_single_fd()... yes
checking for rb_str_subseq()... yes
checking for rb_ary_subseq()... yes
creating Makefile

current directory: /Users/xxxxx/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/kgio-2.11.2/ext/kgio
make "DESTDIR=" clean
make: error: unable to find utility "make", not a developer tool or in PATH

current directory: /Users/xxxxx/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/kgio-2.11.2/ext/kgio
make "DESTDIR="
make: error: unable to find utility "make", not a developer tool or in PATH

make failed, exit code 72

Gem files will remain installed in /Users/xxxxx/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/kgio-2.11.2
for inspection.
Results logged to
/Users/xxxxx/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/extensions/x86_64-darwin-17/2.5.0-static/kgio-2.11.2/gem_make.out

An error occurred while installing kgio (2.11.2), and Bundler cannot continue.
Make sure that `gem install kgio -v '2.11.2' --source 'https://rubygems.org/'` succeeds before bundling.

In Gemfile:
  unicorn was resolved to 5.5.1, which depends on
    kgio

ログに書いてある通り

gem install kgio -v '2.11.2' --source 'https://rubygems.org/'

これも試しましたが同じエラーでした。。

よろしくお願いします。

Answer 1

かいけつしました！
https://teratail.com/questions/202394

Answer 2

初っ端のエラーが重要です
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

以下を参照してください。
https://qiita.com/motty93/items/29e22c6bf811f8dd00ab

Comments

[Nicole_]

回答ありがとうございます。

当該記事は「ruby-filemagic -v 0.6.1 」に対する回答のようで今回の事象には当てはまらないと思われます。

わざわざお答えいただいたにも関わらず、すみません...

Answer 3

以下のサイトの方法でいかがでしょうか。
https://stackoverflow.com/questions/23130139/gem-install-kgio-2-9-2-error

Gemfileに以下を追記

platforms :ruby do
  gem 'unicorn'
end

Comments

[Nicole_]

下記記述しましたが同じエラーが吐かれました...

group :production, :staging do
gem 'unicorn', platforms: [:ruby]
end

もちろん

platforms :ruby do
gem 'unicorn'
end

も試しましたが同じです...