+dnl ** Enable the construction of Win32 DLLs?
+dnl --------------------------------------------------------------
+AC_ARG_ENABLE(win32-dlls,
+[ --enable-win32-dlls
+ If on a Win32 platform running mingw32/cygwin, enable the
+ construction of DLLs containing ghc-compiled code.
+],
+[
+case $HostOS_CPP in
+cygwin32) ;;
+mingw32) ;;
+*) echo "Unrecognised win32 platform: $HostPlatform"
+ exit 1
+ ;;
+esac
+EnableWin32DLLs=YES
+],
+[EnableWin32DLLs=NO]
+)
+AC_SUBST(EnableWin32DLLs)
+if test x"$EnableWin32DLLs" = "xYES" ; then
+ AC_DEFINE(HAVE_WIN32_DLL_SUPPORT)
+fi
+