Fb2edit MinGW

./configure -prefix /usr/i686-pc-mingw32/usr \
  -opensource -release -static \
  -no-exceptions -no-stl -no-qt3support -no-scripttools -no-openssl -no-opengl -no-script \
  -no-scripttools -no-declarative -no-multimedia -no-audio-backend -no-phonon \
  -nomake examples -nomake demos -nomake tools -nomake translations -nomake docs \
  -xplatform win32-g++ -device-option CROSS_COMPILE=i686-w64-mingw32-

i686-pc-mingw32.cmake

# the name of the target operating system
SET(CMAKE_SYSTEM_NAME Windows)

# which compilers to use for C and C++
SET(CMAKE_C_COMPILER i686-w64-mingw32-gcc)
SET(CMAKE_CXX_COMPILER i686-w64-mingw32-g++)
SET(CMAKE_RC_COMPILER i686-w64-mingw32-windres)

# here is the target environment located
SET(CMAKE_FIND_ROOT_PATH  /usr/i686-w64-mingw32)

# adjust the default behaviour of the FIND_XXX() commands:
# search headers and libraries in the target environment, search
# programs in the host environment
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)

cmake -DCMAKE_TOOLCHAIN_FILE=~/i686-pc-mingw32.cmake .
make

Источник: Кросскомпиляция Qt-4.8.0 под mingw32 (x86) в Gentoo (x86_64)