構建新系統：
ubuntu 20.04
mysql 5.7.38
ruby-install and chruby
ruby 3.0.4
redmine 5.0.0
在用戶帳戶中，嘗試安裝 redmine 5.0.0：
bundle install
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.
current directory: /home/test_user/.gem/ruby/3.0.4/gems/mysql2-0.5.4/ext/mysql2
/opt/rubies/ruby-3.0.4/bin/ruby -I /opt/rubies/ruby-3.0.4/lib/ruby/3.0.0 -r ./siteconf20220520-28025-uxnsbe.rb
extconf.rb
...
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. Check the mkmf.log file for more details. You may need configuration options.
Provided configuration options:
...
/opt/rubies/ruby-3.0.4/lib/ruby/3.0.0/mkmf.rb:1050:in `block in find_library': undefined method `split' for
nil:NilClass (NoMethodError)
...
檢查日志，我看到以下錯誤：
conftest.c: In function ‘t’:
conftest.c:14:57: error: ‘rb_wait_for_single_fd’ undeclared (first use in this function)
14 | int t(void) { void ((*volatile p)()); p = (void ((*)()))rb_wait_for_single_fd; return !p; }
conftest.c: In function ‘t’:
conftest.c:16:57: error: ‘rb_enc_interned_str’ undeclared (first use in this function); did you mean ‘rb_interned_str’?
16 | int t(void) { void ((*volatile p)()); p = (void ((*)()))rb_enc_interned_str; return !p; }
我安裝了以下mysql東西：
$ apt list --installed | grep mysql
libmysqlclient20/unknown,now 5.7.38-1ubuntu18.04 amd64 [installed]
mysql-apt-config/unknown,now 0.8.22-1 all [installed]
mysql-client/unknown,now 5.7.38-1ubuntu18.04 amd64 [installed,upgradable to: 8.0.29-0ubuntu0.20.04.3]
mysql-common/focal,now 5.8 1.0.5ubuntu2 all [installed,automatic]
mysql-community-client/unknown,now 5.7.38-1ubuntu18.04 amd64 [installed,automatic]
mysql-community-server/unknown,now 5.7.38-1ubuntu18.04 amd64 [installed]
mysql-server/unknown,now 5.7.38-1ubuntu18.04 amd64 [installed,upgradable to: 8.0.29-0ubuntu0.20.04.3]
我有一點疑惑; ruby 安裝（mkmf.rb，沒有方法'split'）和 redmine 代碼（未宣告的函式）報告了錯誤。
我意識到這是一個新的 ruby?? 和一個新的 redmine，以及一個舊的 mysql；不確定這是否是問題所在。我想堅持使用 mysql 5.7 以避免升級我現在需要遷移的資料。
uj5u.com熱心網友回復：
您缺少其中一個 MySQL 開發包。對于其他偶然發現這個問題的人來說，候選人是：
default-libmysqld-dev
default-libmysqlclient-dev
或者有時只是直接包：
libmysqld-dev
libmysqlclient-dev
在這種特殊情況下，它原來是default-libmysqlclient-dev。
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