mingw64 - Eclipse CDT and MinGW Compiler Build and Clean Errors -

i'm getting started eclipse cdt (luna) , mingw (tdm64-gcc-4.9.2-3 , or mingw64) compiler on windows(x64). seems ok there console outputs makes me worry.

for example when clean project, following errors occur:

cannot run program "rm": launching failed

error: program "rm" not found in path

although can see project gets clean??? i've found rm.exe not in path.

also when try build programs, works fine, following info shows up:

info: internal builder used build

g++ -o0 -g3 -wall -c -fmessage-length=0 -std=c++11 -o version-test.o "..\version-test.cpp"

g++ -o working.exe version-test.o

output of program "version-test" should (same lynda tutorials), generates following output(c++11 features working):

gcc version: 4.9.2 version string: 4.9.2 1 2 three

so here question. why working without real errors, seeing info , error???

are things important???