$ cat ../mingw-w64_cmake.sh
#!/bin/bash
#
#  This script can be used to configure CMake builds with MinGW-W64
#  (64-bit toolchain) under MinGW (32-bit environment).
#

#  Edit the following path variables to match your build environment

MINGW_W64_PATH="c:/mingw-w64-win32/mingw64/bin"
FLTK_SOURCE_PATH="../.."

#  Execute CMake in a new build directory

cmake -G "Unix Makefiles" \
  -D"CMAKE_CXX_COMPILER:FILEPATH=$MINGW_W64_PATH/g++.exe" \
  -D"CMAKE_C_COMPILER:FILEPATH=$MINGW_W64_PATH/gcc.exe" \
  -D"CMAKE_EXE_LINKER_FLAGS:STRING=-static-libstdc++ -static-libgcc" \
  -D"OPTION_OPTIM:STRING=-Wall -W -Wno-missing-field-initializers -Wno-deprecated-declarations -Wno-clobbered -Wno-unused-parameter -Wno-format-nonliteral" \
  $FLTK_SOURCE_PATH

#  Ready to build ...

echo ""
echo "CMake configuration done. Please run 'make' to build FLTK."
echo ""

$ ../mingw-w64_cmake.sh
-- The C compiler identification is GNU 6.1.0
-- The CXX compiler identification is GNU 6.1.0
-- Check for working C compiler: c:/mingw-w64-win32/mingw64/bin/gcc.exe
-- Check for working C compiler: c:/mingw-w64-win32/mingw64/bin/gcc.exe -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler: c:/mingw-w64-win32/mingw64/bin/g++.exe
-- Check for working CXX compiler: c:/mingw-w64-win32/mingw64/bin/g++.exe -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check if the system is big endian
-- Searching 16 bit integer
-- Looking for sys/types.h
-- Looking for sys/types.h - found
-- Looking for stdint.h
-- Looking for stdint.h - found
-- Looking for stddef.h
-- Looking for stddef.h - found
-- Check size of unsigned short
-- Check size of unsigned short - done
-- Using unsigned short
-- Check if the system is big endian - little endian
-- Check size of short
-- Check size of short - done
-- Check size of int
-- Check size of int - done
-- Check size of long
-- Check size of long - done
-- Check size of long long
-- Check size of long long - done
-- Looking for dlsym
-- Looking for dlsym - not found
-- Looking for localeconv
-- Looking for localeconv - found
-- Looking for scandir
-- Looking for scandir - not found
-- Looking for snprintf
-- Looking for snprintf - found
-- Looking for strcasecmp
-- Looking for strcasecmp - found
-- Looking for strlcat
-- Looking for strlcat - not found
-- Looking for strlcpy
-- Looking for strlcpy - not found
-- Looking for vsnprintf
-- Looking for vsnprintf - found
-- Could NOT find Doxygen (missing:  DOXYGEN_EXECUTABLE)
-- Could NOT find PkgConfig (missing:  PKG_CONFIG_EXECUTABLE)
-- Found OpenGL: opengl32
-- Looking for glXGetProcAddressARB
-- Looking for glXGetProcAddressARB - not found
-- Looking for include file pthread.h
-- Looking for include file pthread.h - found
-- Looking for pthread_create
-- Looking for pthread_create - not found
-- Looking for pthread_create in pthreads
-- Looking for pthread_create in pthreads - not found
-- Looking for pthread_create in pthread
-- Looking for pthread_create in pthread - found
-- Found Threads: TRUE
--
cannot find system zlib library - using built-in

--
cannot find system jpeg library - using built-in

--
cannot find system png library - using built-in

-- Configuring done
-- Generating done
-- Build files have been written to: C:/git/fltk/build/mingw-w64

CMake configuration done. Please run 'make' to build FLTK.


$ time make
Scanning dependencies of target fltk_z
[  0%] Building C object zlib/CMakeFiles/fltk_z.dir/adler32.c.obj
[  0%] Building C object zlib/CMakeFiles/fltk_z.dir/compress.c.obj
[  1%] Building C object zlib/CMakeFiles/fltk_z.dir/crc32.c.obj
...
Scanning dependencies of target fltk
[ 20%] Building CXX object src/CMakeFiles/fltk.dir/Fl.cxx.obj
[ 21%] Building CXX object src/CMakeFiles/fltk.dir/Fl_Adjuster.cxx.obj
[ 21%] Building CXX object src/CMakeFiles/fltk.dir/Fl_Bitmap.cxx.obj
...
[ 99%] Generating valuators.cxx, valuators.h
Scanning dependencies of target valuators
[ 99%] Building CXX object test/CMakeFiles/valuators.dir/valuators.cxx.obj
Linking CXX executable ../bin/examples/valuators.exe
[ 99%] Built target valuators
Scanning dependencies of target windowfocus
[100%] Building CXX object test/CMakeFiles/windowfocus.dir/windowfocus.cxx.obj
Linking CXX executable ../bin/examples/windowfocus.exe
[100%] Built target windowfocus

real    6m24.478s
user    0m8.712s
sys     0m16.951s