gegl fails for undeclared identifier HOST_VM_INFO64_COUNT on 10.5

[rmottola (Riccardo)]

on 10.5 64bit I have this failure building gegl:

../gegl-0.4.46/gegl/gegl-config.c:275:5: error: unknown type name 'vm_statistics64_data_t'; did you mean 'vm_statistics_data_t'?
    vm_statistics64_data_t vm_stat;
    ^~~~~~~~~~~~~~~~~~~~~~
    vm_statistics_data_t
/usr/include/mach/vm_statistics.h:100:30: note: 'vm_statistics_data_t' declared here
typedef struct vm_statistics    vm_statistics_data_t;
                                ^
../gegl-0.4.46/gegl/gegl-config.c:276:36: error: use of undeclared identifier 'HOST_VM_INFO64_COUNT'
    unsigned int           count = HOST_VM_INFO64_COUNT;
                                   ^
../gegl-0.4.46/gegl/gegl-config.c:278:12: warning: implicit declaration of function 'host_statistics64' is invalid in C99 [-Wimplicit-function-declaration]
    kret = host_statistics64 (host, HOST_VM_INFO64, (host_info64_t)&vm_stat, &count);
           ^
../gegl-0.4.46/gegl/gegl-config.c:278:54: error: use of undeclared identifier 'host_info64_t'
    kret = host_statistics64 (host, HOST_VM_INFO64, (host_info64_t)&vm_stat, &count);
                                                     ^
../gegl-0.4.46/gegl/gegl-config.c:278:37: error: use of undeclared identifier 'HOST_VM_INFO64'
    kret = host_statistics64 (host, HOST_VM_INFO64, (host_info64_t)&vm_stat, &count);
                                    ^
1 warning and 4 errors generated.

the section is specific to 64bit, I wonder if perhaps on older MacOS (how old?) the 64bit structures did not exist.

[rmottola (Riccardo)]

As a test - just a quick hack: I enabled the 32bit path and everything compiled and linked. Now I cannot test it further, since I still can't rebuild things enough to get gimp running again. I don't know other apps that use gegl.