gegl03-0.3.8 FTBFS on aarch64 due to a crash while building the documentation.  Debugging shows a bogus return value from realpath in operations/core/load.c, stemming from:

load.c: In function 'do_setup':
load.c:121:30: warning: implicit declaration of function 'realpath' [-Wimplicit-function-declaration]
       gchar *resolved_path = realpath (path, NULL);
                              ^~~~~~~~
load.c:121:30: warning: initialization makes pointer from integer without a cast [-Wint-conversion]
load.c:141:15: warning: implicit declaration of function 'free' [-Wimplicit-function-declaration]
               free (resolved_path);
               ^~~~
load.c:141:15: warning: incompatible implicit declaration of built-in function 'free'
load.c:141:15: note: include '<stdlib.h>' or provide a declaration of 'free'
load.c:145:11: warning: incompatible implicit declaration of built-in function 'free'
           free (resolved_path);
           ^~~~
load.c:145:11: note: include '<stdlib.h>' or provide a declaration of 'free'

This warning also occurs on armhfp but does not crash because it is a 32-bit arch.  The warning does not occur on x86_64 only because the OpenCL headers include xmmintrin.h thereon, which ultimately pulls in the entire stdlib.h.

The root cause is the erroneous removal of #include <stdlib.h> in:

https://git.gnome.org/browse/gegl/commit/?id=442f6832701c4fba63a3564e6dd5ff1b9583a3a6

operations/core/load.c needs to #include <stdlib.h> to fix this issue.