Varnish included in MAMP Stack doesn't work

• Install MAMP Stack 5.4.13-1 64 bit on OS X.
• Enable Varnish.
• Start Varnish.

varnish fails to start:

Starting varnish...
Exit code: 3
Stdout:
SMF.s0: filename: /Applications/mampstack-5.4.13-1/varnish/var/varnish/varnish_storage.bin size 1024 MB.
/Applications/mampstack-5.4.13-1/varnish/scripts/ctl.sh : varnish could not be started
Stderr:
Message from dlopen:
Compiled VCL program failed to load:
  dlopen(./vcl.rgj4DK5Q.so, 6): no suitable image found.  Did find:
    ./vcl.rgj4DK5Q.so: mach-o, but wrong architecture
Running dlopen failed, exit 1

VCL compilation failed