Makefile21 recipe commences before first target Stop

This error message is usually encountered when there is a syntax error in the Makefile.

In this specific case, it indicates that there is a recipe (commands for building a target) starting before the first target declaration. A Makefile should always start with a target declaration before any recipes.

To fix this error, you need to ensure that you have defined at least one target before specifying any recipes. Here is an example of a basic Makefile structure:

target_name:
    # recipe commands for building the target

.PHONY: target_name

Make sure to replace "target_name" with an actual target name and provide the appropriate recipe commands for building that target.

If you provide your Makefile content, I can assist you in identifying the specific issue