AC_ARG_ENABLE(gsharing, [ --enable-gsharing Enable gsharing], enable_gsharing=$enableval, enable_gsharing=no)
if test x$enable_gsharing = xyes; then
AC_ARG_ENABLE(gsharing, [ --enable-gsharing Enable gsharing], enable_gsharing=$enableval, enable_gsharing=no)
if test x$enable_gsharing = xyes; then