v v v v v v v
    if os(windows)
      hs-source-dirs: src/win32
      include-dirs:   src/win32
      other-modules:  CtrlC
                      System.Posix
                      System.Posix.Files
                      System.Posix.IO
      cpp-options:    -DWIN32
      c-sources:      src/win32/send_email.c
      build-depends:  unix-compat >= 0.1.2
=============
    cpp-options:      -DGADT_WITNESSES=1

    if os(windows)
      hs-source-dirs: src/win32
      include-dirs:   src/win32
      other-modules:  CtrlC
                      System.Posix
                      System.Posix.Files
                      System.Posix.IO
      cpp-options:    -DWIN32
      c-sources:      src/win32/send_email.c
      build-depends:  unix-compat >= 0.1.2,
                      regex-posix >= 0.94.4 && < 0.95
*************
  cpp-options:      -DGADT_WITNESSES=1

  if os(windows)
    hs-source-dirs: src/win32
    include-dirs:   src/win32
    other-modules:  CtrlC
                    System.Posix
                    System.Posix.Files
                    System.Posix.IO
    cpp-options:    -DWIN32
    c-sources:      src/win32/send_email.c
    build-depends:  unix-compat >= 0.1.2,
                    regex-posix >= 0.94.4 && < 0.95
*************
  if os(windows)
    hs-source-dirs: src/win32
    include-dirs:   src/win32
    other-modules:  CtrlC
                    System.Posix
                    System.Posix.Files
                    System.Posix.IO
    cpp-options:    -DWIN32
    c-sources:      src/win32/send_email.c
    build-depends:  unix-compat >= 0.1.2,
                    regex-posix >= 0.94.4 && < 0.95
*************
  if os(windows)
    hs-source-dirs: src/win32
    include-dirs:   src/win32
    other-modules:  CtrlC
                    System.Posix
                    System.Posix.Files
                    System.Posix.IO
    cpp-options:    -DWIN32
    c-sources:      src/win32/send_email.c
    build-depends:  unix-compat >= 0.1.2,
                    regex-posix >= 0.94.4 && < 0.95
^ ^ ^ ^ ^ ^ ^