ninja problem: bad $-escape (literal $ must be written as $$)

[LightSun]

E:\pros\lib_pdfium>make -f makefile_ninja_win android-arm64-debug -j4
windows
make -R -C .build/projects/ninja-android-arm64 config=debug
make[1]: Entering directory 'E:/pros/lib_pdfium/.build/projects/ninja-android-arm64'
==== Building all (debug) ====
ninja: error: fx_icu.ninja:9: bad $-escape (literal $ must be written as $$)
  command     = cmd /c "$(ANDROID_NDK_CLANG)/bin/clang $defines $include...
                        ^ near here
ninja: Entering directory `debug'
make[1]: *** [Makefile:14: all] Error 1
make[1]: Leaving directory 'E:/pros/lib_pdfium/.build/projects/ninja-android-arm64'
make: *** [makefile_ninja_win:93: android-arm64-debug] Error 2