Given following log snippets, their explanation, and nothing else, explain what failure, if any, occurred during build of this package.

  Snippets are in a format of [X] : [Y], where [X] is a log snippet, and [Y] is the explanation.

  Snippets are delimited with '================'.

  Drawing on information from all snippets, provide a concise explanation of the issue and recommend a solution.

  Explanation of the issue, and recommended solution, should take a handful of sentences.

  Snippets:

  [Whoeaaa!  There's something fishy going on here.
You have a look and see if you detect anything uncanny:
*******************************************************
gcc _autotst.c -o _autotst
_autotst.c:1:1: error: return type defaults to ‘int’ [-Wimplicit-int]
    1 | main()
      | ^~~~
::::
cc _autotst.c -o _autotst
_autotst.c:1:1: error: return type defaults to ‘int’ [-Wimplicit-int]
    1 | main()
      | ^~~~
::::
gcc _autotst.c -o _autotst
_autotst.c:1:1: error: return type defaults to ‘int’ [-Wimplicit-int]
    1 | main()
      | ^~~~
::::
*******************************************************
I suggest you take a look at the definition of CFLAGS* and CC
in the Makefile before you try make again.]: [The log snip shows error during configure phase where the script tries to autodetect compiler and it abilities.]

Issue: The failure is related to the switch to C23 C standard which disallows definition of function without type.
Resolution: Either add void type to the main() function definiton in the source code or add -std=gnu17 to the CFLAGS to compile with the GNU17 older standard.