我尝试安装瘦Web服务器1.7.2版，但出现错误
与日志：
thin.c:359:10: error: implicit declaration of function 'thin_http_parser_has_error' is invalid in C99
[-Werror,-Wimplicit-function-declaration]
return thin_http_parser_has_error(http) ? Qtrue : Qfalse;
^
thin.c:374:10: error: implicit declaration of function 'thin_http_parser_is_finished' is invalid in C99
[-Werror,-Wimplicit-function-declaration]
return thin_http_parser_is_finished(http) ? Qtrue : Qfalse;
^
9 errors generated.
make: *** [thin.o] Error 1
make failed, exit code 2
Gem files will remain installed in
/Users/dorianmarie/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/thin-1.7.2 for inspection.
Results logged to
/Users/dorianmarie/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/extensions/x86_64-darwin-19/2.7.0/thin-1.7.2/gem_make.out
An error occurred while installing thin (1.7.2), and Bundler cannot continue.
Make sure that `gem install thin -v '1.7.2' --source 'https://rubygems.org/'` succeeds before bundling.
禁用该错误可以解决此问题：
bundle config build.thin --with-cflags="-Wno-error=implicit-function-declaration"
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