I do:
1- cd c:\qwt-6.1.2
2- qmake qwt.pro
3- mingw32-make //when i want to do this step i give this error:

c:\qwt-6.1.2>mingw32-make
cd src\ && ( if not exist Makefile C:\Qt\Qt5.4.2\5.4\mingw491_32\bin\qmake.exe C
:\qwt-6.1.2\src\src.pro -o Makefile ) && mingw32-make -f Makefile
makefile:41: recipe for target 'sub-src-make_first-ordered' failed
mingw32-make: *** [sub-src-make_first-ordered] Error 1


please help me.