我试图用react-native-firebase（https://rnfirebase.io/docs/v5.x.x/installation/basic-kit）制作一个基本的react native应用程序，但是在第三步中，在IOS文件夹中执行“ pod install”时，我遇到了这个问题：
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for arm-apple-darwin-strip... no
checking for strip... strip
checking for a thread-safe mkdir -p... /bin/mkdir -p
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking whether make supports nested variables... yes
checking for arm-apple-darwin-gcc... -arch armv7 -isysroot
checking whether the C compiler works... no
/bin/bash: line 24: xcrun: command not found
/bin/bash: line 24: xcrun: command not found
/home/mistermboy/Library/Caches/CocoaPods/Pods/External/glog/2263bd123499e5b93b5efe24871be317-1f3da/missing: Unknown `--is-lightweight' option
Try `/home/mistermboy/Library/Caches/CocoaPods/Pods/External/glog/2263bd123499e5b93b5efe24871be317-1f3da/missing --help' for more information
configure: WARNING: 'missing' script is too old or missing
configure: error: in `/home/mistermboy/Library/Caches/CocoaPods/Pods/External/glog/2263bd123499e5b93b5efe24871be317-1f3da':
configure: error: C compiler cannot create executables
See `config.log' for more details