我遇到以下权限错误，该如何解决。我是新来的啤酒。
我有两个用户，一个是管理员，我曾经用来安装软件包，我可以使用该用户来运行pub get，但是我的另一个用户无法执行。普通用户如何使用它？
$ pub get
/usr/local/bin/pub: line 2:
/usr/local/Cellar/dart/2.1.0/libexec/bin/pub: Permission denied
/usr/local/bin/pub: line 2: exec:
/usr/local/Cellar/dart/2.1.0/libexec/bin/pub: cannot execute: Permission denied
似乎对当前用户和我安装dart的权限都可以。
根据@JBallin的请求，在此处添加brew doctor输出：
Please note that these warnings are just used to help the Homebrew maintainers
with debugging if you file an issue. If everything you use Homebrew for is
working fine: please don't worry or file an issue; just ignore this.
Warning: Broken symlinks were found. Remove them with `brew cleanup`:
/usr/local/bin/dart
Warning: Unbrewed dylibs were found in /usr/local/lib.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae, and may need to be deleted.
Unexpected dylibs:
/usr/local/lib/libpcre.1.dylib
/usr/local/lib/libpcre2-8.0.dylib
/usr/local/lib/libpcre2-posix.1.dylib
/usr/local/lib/libpcrecpp.0.dylib
/usr/local/lib/libpcreposix.0.dylib
/usr/local/lib/libtcl8.6.dylib
/usr/local/lib/libtk8.6.dylib
Warning: Unbrewed .la files were found in /usr/local/lib.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae, and may need to be deleted.
Unexpected .la files:
/usr/local/lib/libpcre.la
/usr/local/lib/libpcre2-8.la
/usr/local/lib/libpcre2-posix.la
/usr/local/lib/libpcrecpp.la
/usr/local/lib/libpcreposix.la
Warning: Unbrewed .pc files were found in /usr/local/lib/pkgconfig.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae, and may need to be deleted.
Unexpected .pc files:
/usr/local/lib/pkgconfig/libpcre.pc
/usr/local/lib/pkgconfig/libpcre2-8.pc
/usr/local/lib/pkgconfig/libpcre2-posix.pc
/usr/local/lib/pkgconfig/libpcrecpp.pc
/usr/local/lib/pkgconfig/libpcreposix.pc
/usr/local/lib/pkgconfig/tcl.pc
/usr/local/lib/pkgconfig/tk.pc
Warning: Unbrewed static libraries were found in /usr/local/lib.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae, and may need to be deleted.
Unexpected static libraries:
/usr/local/lib/libpcre.a
/usr/local/lib/libpcre2-8.a
/usr/local/lib/libpcre2-posix.a
/usr/local/lib/libpcrecpp.a
/usr/local/lib/libpcreposix.a
/usr/local/lib/libtclstub8.6.a
/usr/local/lib/libtkstub8.6.a
Warning: You have unlinked kegs in your Cellar
Leaving kegs unlinked can lead to build-trouble and cause brews that depend on
those kegs to fail to run properly once built. Run `brew link` on these:
pcre
Warning: Some installed formulae are missing dependencies.
You should `brew install` the missing dependencies:
brew install php
Run `brew missing` for more details.
请参阅上述信息以了解冲煮医生。
谢谢。