I'm getting quite baffling compilation errors from Strawberry Perl as seen here.

The errors look like this: 

In file included from Libdeflate.xs:3:
C:\STRAWB~1\perl\lib\CORE/XSUB.h:615:21: error: 'PerlMem_malloc' undec
+lared here (not in a function); did you mean 'Perl_malloc'?
 #    define malloc  PerlMem_malloc
                     ^~~~~~~~~~~~~~
C:\STRAWB~1\perl\lib\CORE/XSUB.h:615:21: note: in definition of macro 
+'malloc'
 #    define malloc  PerlMem_malloc
                     ^~~~~~~~~~~~~~
C:\STRAWB~1\perl\lib\CORE/XSUB.h:618:19: error: 'PerlMem_free' undecla
+red here (not in a function); did you mean 'Perl_sv_free'?
 #    define free  PerlMem_free
                   ^~~~~~~~~~~~
C:\STRAWB~1\perl\lib\CORE/XSUB.h:618:19: note: in definition of macro 
+'free'
 #    define free  PerlMem_free
                   ^~~~~~~~~~~~
gmake: *** [Makefile:340: Libdeflate.o] Error 1
-> FAIL Installing Gzip-Libdeflate-0.01_01.tar.gz failed. See C:\Users
+\ben\.cpanm\work\1613793219.7300\build.log for details. Retry with --
+force to force install it.

[download]

On my Perl XSUB.h defines free as above, but I don't understand what this error even means, since it is coming from a #define line where what is on the right shouldn't matter.

I've tried everything I can think of to work out what is happening, but I'm completely stumped.

In reply to Baffling compilation errors from Strawberry Perl by no longer just digit

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