rebar.config

{port_env, [
    %% add MS Visual C++ support to rebar on Windows
    {"win32", "CC", "cl.exe"},
    {"win32", "CXX", "cl.exe"},
    {"win32", "LINKER", "link.exe"},

    {"win32", "DRV_CXX_TEMPLATE",
     "$CXX /c $CXXFLAGS $DRV_CFLAGS $PORT_IN_FILES /Fo$PORT_OUT_FILE"},
    {"win32", "DRV_CC_TEMPLATE",
     "$CC /c $CFLAGS $DRV_CFLAGS $PORT_IN_FILES /Fo$PORT_OUT_FILE"},
    {"win32", "DRV_LINK_TEMPLATE",
     "$LINKER $PORT_IN_FILES $LDFLAGS $DRV_LDFLAGS /OUT:$PORT_OUT_FILE"},

    {"win32", "EXE_CXX_TEMPLATE",
     "$CXX /c $CXXFLAGS $EXE_CFLAGS $PORT_IN_FILES /Fo$PORT_OUT_FILE"},
    {"win32", "EXE_CC_TEMPLATE",
     "$CC /c $CFLAGS $EXE_CFLAGS $PORT_IN_FILES /Fo$PORT_OUT_FILE"},
    {"win32", "EXE_LINK_TEMPLATE",
     "$LINKER $PORT_IN_FILES $LDFLAGS $EXE_LDFLAGS /OUT:$PORT_OUT_FILE"},

    %% ERL_CFLAGS are ok as -I even though strictly it should be /I
    {"win32", "ERL_LDFLAGS", " /LIBPATH:$ERL_EI_LIBDIR erl_interface.lib ei.lib"},
    {"win32", "DRV_CFLAGS", "/Zi /Wall $ERL_CFLAGS"},
    {"win32", "DRV_LDFLAGS", "/DLL $ERL_LDFLAGS"}
    %% app-specific flags would go here
]}.