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There are several possible reasons why the "else" command within a make file might fail:

1. Syntax error: If the syntax of the "else" command is incorrect, the make file will fail to execute it. Make sure that the "else" command is correctly formatted with the correct spacing, punctuation, and keywords.

2. Missing dependencies: If the "else" command relies on certain dependencies that are not specified in the make file, it will fail to execute. Ensure that all necessary dependencies are included in the make file.

3. Incorrect logic: The "else" command may not be executing because the logic of the make file is incorrect. Check that the conditions for the "else" statement are properly set up and that they evaluate to the expected results.

4. Variables not properly defined: If variables that are used in the "else" command are not properly defined or initialized, the command may fail to execute. Check that all variables used in the make file are correctly defined and initialized.