SITL. Cannot pass a build target for sim_vehicle.py in cygwin64

I am trying to pass a build target (-b omnibusF4pro) in a sim_vehicle.py call in cygwin64 and this is the error I am getting. I do successfully compile for this target using Eclipse and Cygwin64. Anyone got any pointers?

marc@DESKTOP-M2HFP4E ~
$ sim_vehicle.py -v ArduPlane -f plane-vtail -b omnibusF4pro -l 42.221875,-87.907888,0,90 --console --map
SIM_VEHICLE: Start
SIM_VEHICLE: Killing tasks
SIM_VEHICLE: Starting up at 42.221875,-87.907888,0,90
SIM_VEHICLE: WAF build
SIM_VEHICLE: Configure waf
SIM_VEHICLE: “/home/marc/ardupilot/modules/waf/waf-light” “configure” “–board” “sitl”
Setting top to : /home/marc/ardupilot
Setting out to : /home/marc/ardupilot/build
Autoconfiguration : enabled
Setting board to : sitl
Using toolchain : native
Checking for ‘g++’ (C++ compiler) : /usr/bin/g++
Checking for ‘gcc’ (C compiler) : /usr/bin/gcc
Checking for c flags ‘-MMD’ : yes
Checking for cxx flags ‘-MMD’ : yes
Checking for need to link with librt : not necessary
Checking for feenableexcept : no
Checking for HAVE_CMATH_ISFINITE : yes
Checking for HAVE_CMATH_ISINF : yes
Checking for HAVE_CMATH_ISNAN : yes
Checking for NEED_CMATH_ISFINITE_STD_NAMESPACE : yes
Checking for NEED_CMATH_ISINF_STD_NAMESPACE : yes
Checking for NEED_CMATH_ISNAN_STD_NAMESPACE : yes
Checking for header endian.h : yes
Checking for header byteswap.h : yes
Checking for HAVE_MEMRCHR : no
Checking for program ‘python’ : /usr/bin/python
Checking for python version >= 2.7.0 : 2.7.16
Checking for program ‘python’ : /usr/bin/python
Checking for python version >= 2.7.0 : 2.7.16
Source is git repository : yes
Update submodules : yes
Checking for program ‘git’ : /usr/bin/git
Checking for program ‘size’ : /usr/bin/size
Benchmarks : disabled
Unit tests : enabled
Scripting : enabled
Scripting runtime checks : enabled
Checking for program ‘rsync’ : /usr/bin/rsync
‘configure’ finished successfully (6.278s)
SIM_VEHICLE: Building
SIM_VEHICLE: “/home/marc/ardupilot/modules/waf/waf-light” “build” “–target” “omnibusF4pro”
Waf: Entering directory /home/marc/ardupilot/build/sitl' Embedding file sandbox.lua:libraries/AP_Scripting/scripts/sandbox.lua Waf: Leaving directory /home/marc/ardupilot/build/sitl’
Could not find a task generator for the name ‘omnibusF4pro’
SIM_VEHICLE: Build failed
SIM_VEHICLE: Killing tasks