Using Qt 5.2 (last step in the guide)

C:\bitcoin-0.8.6>mingw32-make -f Makefile.Release
cd C:/bitcoin-0.8.6/src/leveldb && CC=gcc CXX=g++ TARGET_OS=OS_WINDOWS_CROSSCOMP
ILE mingw32-make OPT="-pipe -fno-keep-inline-dllexport -D_FORTIFY_SOURCE=2 -O2"
libleveldb.a libmemenv.a && ranlib C:/bitcoin-0.8.6/src/leveldb/libleveldb.a &&
ranlib C:/bitcoin-0.8.6/src/leveldb/libmemenv.a
'CC' is not recognized as an internal or external command,
operable program or batch file.
Makefile.Release:319: recipe for target 'C:/bitcoin-0.8.6/src/leveldb/libleveldb
.a' failed
mingw32-make: *** [C:/bitcoin-0.8.6/src/leveldb/libleveldb.a] Error 1



Thanks