On Mon, Aug 31, 2020 at 02:52:44PM +0100, David Fussner via Bug reports for GNU Emacs, the Swiss army knife of text editors wrote:
> For the last week or so I'm seeing this warning when compiling master,
> always using the simple command 'make' in the git repo:
> 
>   CC       image.o
> image.c: In function 'svg_load_image':
> image.c:9892:3: warning: implicit declaration of function 'free'
> [-Wimplicit-function-declaration]
>    free (wrapped_contents);
>    ^
> image.c:9892:3: warning: incompatible implicit declaration of built-in
> function 'free'
> image.c:9892:3: note: include '<stdlib.h>' or provide a declaration of
> 'free'
> 
> This is a 32-bit build, and Slackware 14.2's gcc is 5.5.0. The
> executable runs just fine.
> 
> The warning appears after commit
> 8f42b94fe43911c6b0c7e519ba439d61459dc744 by Alan Third:
> Set basic SVG attributes (bug#40845)
> 
> Including <stdlib.h> at the top of image.c does silence the warning.

Hi, can you please try the attached patch.
-- 
Alan Third