AC_ARG_ENABLE([sysfsgpio],
AS_HELP_STRING([--enable-sysfsgpio], [Enable building support for programming driven via sysfs gpios.]),
[build_sysfsgpio=$enableval], [build_sysfsgpio=no])
AC_ARG_ENABLE([sysfsgpio],
AS_HELP_STRING([--enable-sysfsgpio], [Enable building support for programming driven via sysfs gpios.]),
[build_sysfsgpio=$enableval], [build_sysfsgpio=no])