Using "configure.cmd ninja" shows a warning: Unrecognized switch "ninja"

C:\build\reactos>configure.cmd ninja

Detected RosBE for i386

Creating directories in output-MinGW-i386

Preparing reactos...

-- The C compiler identification is GNU 8.4.0

-- The CXX compiler identification is GNU 8.4.0

-- Check for working C compiler: C:/RosBE/i386/bin/gcc.exe

-- Check for working C compiler: C:/RosBE/i386/bin/gcc.exe - works

-- Detecting C compiler ABI info

-- Detecting C compiler ABI info - done

-- Detecting C compile features

-- Detecting C compile features - done

-- Check for working CXX compiler: C:/RosBE/i386/bin/g++.exe

-- Check for working CXX compiler: C:/RosBE/i386/bin/g++.exe - works

-- Detecting CXX compiler ABI info

-- Detecting CXX compiler ABI info - done

-- Detecting CXX compile features

-- Detecting CXX compile features - done

-- Setting build type to Debug as none was specified.

-- Found Git: C:/Git/cmd/git.exe (found version "2.40.1.windows.1")

-- Found BISON: C:/RosBE/bin/bison.exe (found version "3.5.4")

-- Found FLEX: C:/RosBE/bin/flex.exe (found version "2.6.4")

-- Build Type: Debug

CMake Warning at CMakeLists.txt:192 (message):

  -- Disabling precompiled headers on GCC by default CORE-17108.

-- The ASM compiler identification is GNU

-- Found assembler: C:/RosBE/i386/bin/gcc.exe

-- Selected localization: all

-- umandlg has no base address

-- browser has no base address

-- hotplug has no base address

-- qcap has no base address

-- mydocs has no base address

-- dbgeng has no base address

-- fusion has no base address

-- fusion_1_1 has no base address

-- fusion_2_0 has no base address

-- profmap has no base address

-- regapi has no base address

-- storprop has no base address

-- ntprint has no base address

-- Configuring done

-- Generating done

-- Build files have been written to: C:/build/reactos/output-MinGW-i386

Configure script complete! Execute appropriate build commands (ex: ninja, make,

nmake, etc...) from output-MinGW-i386

C:\build\reactos>

C:\build\reactos>configure.cmd ninja

Detected RosBE for i386

  Warning: Unrecognized switch "ninja"

Creating directories in output-MinGW-i386

Preparing reactos...

-- The C compiler identification is GNU 8.4.0

-- The CXX compiler identification is GNU 8.4.0

-- Check for working C compiler: C:/RosBE/i386/bin/gcc.exe

-- Check for working C compiler: C:/RosBE/i386/bin/gcc.exe - works

-- Detecting C compiler ABI info

-- Detecting C compiler ABI info - done

-- Detecting C compile features

-- Detecting C compile features - done

-- Check for working CXX compiler: C:/RosBE/i386/bin/g++.exe

-- Check for working CXX compiler: C:/RosBE/i386/bin/g++.exe - works

-- Detecting CXX compiler ABI info

-- Detecting CXX compiler ABI info - done

-- Detecting CXX compile features

-- Detecting CXX compile features - done

-- Setting build type to Debug as none was specified.

-- Found Git: C:/Git/cmd/git.exe (found version "2.40.1.windows.1")

-- Found BISON: C:/RosBE/bin/bison.exe (found version "3.5.4")

-- Found FLEX: C:/RosBE/bin/flex.exe (found version "2.6.4")

-- Build Type: Debug

CMake Warning at CMakeLists.txt:192 (message):

  -- Disabling precompiled headers on GCC by default CORE-17108.

-- The ASM compiler identification is GNU

-- Found assembler: C:/RosBE/i386/bin/gcc.exe

-- Selected localization: all

-- umandlg has no base address

-- browser has no base address

-- hotplug has no base address

-- qcap has no base address

-- mydocs has no base address

-- dbgeng has no base address

-- fusion has no base address

-- fusion_1_1 has no base address

-- fusion_2_0 has no base address

-- profmap has no base address

-- regapi has no base address

-- storprop has no base address

-- ntprint has no base address

-- Configuring done

-- Generating done

-- Build files have been written to: C:/build/reactos/output-MinGW-i386

Configure script complete! Execute appropriate build commands (ex: ninja, make,

nmake, etc...) from output-MinGW-i386

C:\build\reactos>