trick/autoconf/m4/tr_udunits_home.m4

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AC_DEFUN([TR_UDUNITS_HOME],[
AC_ARG_WITH([udunits],
AS_HELP_STRING([--with-udunits@<:@=DIR@:>@], [UDUnits root directory]),
[UDUNITS_HOME="$withval"],
[UDUNITS_HOME=""]
)
AC_SUBST([UDUNITS_HOME])
])