我正在使用Ruby 3.0.1p64版本，运行于macOS BigSur 11.04系统，已安装并运行MySQL。
在运行bundle install时，提示需要安装mysql2。
我尝试通过以下方式安装mysql2 gem：
sudo gem install mysql2 -v '0.5.3' --source 'https://rubygems.org/'
我得到了这个：
Building native extensions. This could take a while...
ERROR: Error installing mysql2:
ERROR: Failed to build gem native extension.
current directory: /Users/henri/.rbenv/versions/3.0.1/lib/ruby/gems/3.0.0/gems/mysql2-0.5.3/ext/mysql2
/Users/henri/.rbenv/versions/3.0.1/bin/ruby -I /Users/henri/.rbenv/versions/3.0.1/lib/ruby/3.0.0 -r ./siteconf20210617-53969-y4phap.rb extconf.rb
checking for rb_absint_size()... yes
checking for rb_absint_singlebit_p()... yes
checking for rb_wait_for_single_fd()... yes
*** 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:
--with-opt-dir
--without-opt-dir
--with-opt-include
--without-opt-include=${opt-dir}/include
--with-opt-lib
--without-opt-lib=${opt-dir}/lib
--with-make-prog
--without-make-prog
--srcdir=.
--curdier
--ruby=/Users/henri/.rbenv/versions/3.0.1/bin/$(RUBY_BASE_NAME)
--with-mysql-dir
--without-mysql-dir
--with-mysql-include
--without-mysql-include=${mysql-dir}/include
--with-mysql-lib
--without-mysql-lib=${mysql-dir}/lib
--with-mysql-config
--without-mysql-config
--with-mysqlclient-dir
--without-mysqlclient-dir
--with-mysqlclient-include
--without-mysqlclient-include=${mysqlclient-dir}/include
--with-mysqlclient-lib
--without-mysqlclient-lib=${mysqlclient-dir}/lib
--with-mysqlclientlib
--without-mysqlclientlib
/Users/henri/.rbenv/versions/3.0.1/lib/ruby/3.0.0/mkmf.rb:1050:in `block in find_library': undefined method `split' for nil:NilClass (NoMethodError)
from /Users/henri/.rbenv/versions/3.0.1/lib/ruby/3.0.0/mkmf.rb:1050:in `collect'
from /Users/henri/.rbenv/versions/3.0.1/lib/ruby/3.0.0/mkmf.rb:1050:in `find_library'
from extconf.rb:87:in `<main>'
To see why this extension failed to compile, please check the mkmf.log which can be found here:
/Users/henri/.rbenv/versions/3.0.1/lib/ruby/gems/3.0.0/extensions/arm64-darwin-20/3.0.0/mysql2-0.5.3/mkmf.log
extconf failed, exit code 1
我的 mkmf.log 文件如下：
--------------------
have_func: checking for rb_wait_for_single_fd()... -------------------- yes
"clang -fdeclspec -o conftest -I/Users/henriknafo/.rbenv/versions/3.0.1/include/ru$
conftest.c:14:57: error: use of undeclared identifier 'rb_wait_for_single_fd'
int t(void) { void ((*volatile p)()); p = (void ((*)()))rb_wait_for_single_fd; ret$
^
1 error generated.
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: /*top*/
4: extern int t(void);
5: int main(int argc, char **argv)
6: {
7: if (argc > 1000000) {
8: int (* volatile tp)(void)=(int (*)(void))&t;
9: printf("%d", (*tp)());
10: }
11:
12: return !!argv[argc];
13: }
14: int t(void) { void ((*volatile p)()); p = (void ((*)()))rb_wait_for_single_fd;$
/* end */
这可能与 Ruby 3.0.1 不兼容吗？ 我应该安装哪个库，才能安装 mysql2 gem？
有人有建议吗？
sudo安装 gem。除了安全问题外，您还会在文件权限方面遇到未来的问题。https://www.moncefbelyamani.com/why-you-should-never-use-sudo-to-install-ruby-gems/ - maxsudo。 - Victor S