C:\Users\' is not recognized as an internal or external command

Hi, i want compile opencv for QT. i use this tutorial  http://www.laganiere.name/opencvCookbook/chap1s1_2.shtml in step 8 i have this error: C:\opencv_bin1>mingw32-make                                                     [  0%] Building C object 3rdparty/zlib/CMakeFiles/zlib.dir/adler32.c.obj        'C:\Users\' is not recognized as an internal or external command,               operable program or batch file.                                                 3rdparty\zlib\CMakeFiles\zlib.dir\build.make:53: recipe for target '3rdparty/zlib/CMakeFiles/zlib.dir/adler32.c.obj' failed                                     mingw32-make[2]: *** [3rdparty/zlib/CMakeFiles/zlib.dir/adler32.c.obj] Error 1  CMakeFiles\Makefile2:269: recipe for target '3rdparty/zlib/CMakeFiles/zlib.dir/all' failed                                                                      mingw32-make[1]: *** [3rdparty/zlib/CMakeFiles/zlib.dir/all] Error 2            makefile:112: recipe for target 'all' failed                                    mingw32-make: *** [all] Error 2                                                 i think it is from path variable but i don’t see mistake in it. any idea?