waf_build_fail_2

$ ./waf configure --board=px4-v2 \
> && ./waf sub
Setting top to                           : /home/prince/TEST/ardupilot
Setting out to                           : /home/prince/TEST/ardupilot/build
Autoconfiguration                        : enabled
Setting board to                         : px4-v2
Checking for program 'arm-none-eabi-ar'  : /usr/bin/arm-none-eabi-ar
Using toolchain                          : arm-none-eabi
Checking for 'g++' (C++ compiler)        : /usr/bin/arm-none-eabi-g++
Checking for 'gcc' (C compiler)          : /usr/bin/arm-none-eabi-gcc
Checking for HAVE_CMATH_ISFINITE         : no
Checking for HAVE_CMATH_ISINF            : no
Checking for HAVE_CMATH_ISNAN            : no
Checking for NEED_CMATH_ISFINITE_STD_NAMESPACE : no
Checking for NEED_CMATH_ISINF_STD_NAMESPACE    : no
Checking for NEED_CMATH_ISNAN_STD_NAMESPACE    : no
Checking for header endian.h                   : not found
Checking for header byteswap.h                 : not found
Checking for program 'cmake'                   : /usr/bin/cmake
Checking cmake version                         : 3.5.1
Checking for program 'ninja, ninja-build'      : not found
Checking for program 'make'                    : /usr/bin/make
Checking for program 'python'                  : /usr/bin/python
Checking for python version >= 2.7.0           : 2.7.12
Checking for program 'python'                  : /usr/bin/python
Checking for python version >= 2.7.0           : 2.7.12
Source is git repository                       : yes
Update submodules                              : yes
Checking for program 'git'                     : /usr/bin/git
Gtest                                          : PX4 boards currently don't support compiling gtest
Checking for program 'arm-none-eabi-size'      : /usr/bin/arm-none-eabi-size
Benchmarks                                     : disabled
Unit tests                                     : disabled
'configure' finished successfully (0.694s)
Waf: Entering directory `/home/prince/TEST/ardupilot/build/px4-v2'
[13/14] CMake Build px4 msg_gen
make: *** No rule to make target 'msg_gen'.  Stop.

Waf: Leaving directory `/home/prince/TEST/ardupilot/build/px4-v2'
Build failed
 -> task in 'px4_msg_gen' failed (exit status 2):
	{task 139741973486560: cmake_build_task  -> }
['/usr/bin/cmake', '--build', '/home/prince/TEST/ardupilot/build/px4-v2/modules/PX4Firmware', '--target', 'msg_gen']