The code patch you provided seems to handle the build process based on the operating system and architecture. Here's a brief review with some suggestions:

1. Variable Naming: It's generally recommended to use lowercase letters for variable names in Makefiles. For example, consider changing UNAME to uname and UNAME_M to uname_m.

2. Comment Clarity: The comment indicating the command for Linux in the build target can be clarified by mentioning that it's specifically for x86_64 architecture ("Linux x86_64").

3. Error Handling: It's a good practice to include error handling in your code. In this case, if the operating system is neither Linux nor macOS, the code doesn't handle the situation. You might want to add an error message or fallback mechanism when the conditions are not met.

Apart from these suggestions, the code patch looks fine and should work as intended.

Do you need to consider the situation of Linux and arm architecture?

done

The code patch includes a build target in a Makefile to handle cross-compilation for different operating systems and architectures. Here are some bug risks and improvement suggestions:

1. Typo: In line 11, ARCH should be assigned the output of uname -m, not "uname -m".
2. Typo: In line 14, BRANCH should use double backticks (``) instead of single quotes ('') as the sed command requires backticks.
3. In line 65, there's a typo (arm6411) instead of arm64. Fixing that will ensure the correct architecture is used for building on Linux.
4. Consider adding error handling for the shell commands. If any of the uname or git branch commands fail, it would be good to display an error message.

Apart from these minor issues, the code looks fine in terms of handling different operating systems (Linux and Darwin) and architectures (x86_64 and arm64). It sets the appropriate values for GOOS and GOARCH environment variables and executes the go build command accordingly.