mlton port and bootstrap auto-dependency

Hallo,
I recently committed wip/mlton.
mlton: http://mlton.org is an optimizing sml compiler.
I provided two bootstrapping procedures, the first needs
smlnj and works fine but requires huge resources: more than
1.5 Gb memory and 3-8 hours cpu usage.
The second procedure uses mlton itself and compiles in 15 min.
but it does not work inside pkgsrc.
The procedure uses include files and static libraries installed
with mlton itself;
I attempted to use the buildlink3 framework but buildlink3
ignores any self-dependency.
I browsed both the documentation and some of the mk sources
but was not able to find the solution of this dilemma.
Imho, since mlton is already installed as a package, buildlink3
has no good reason to ignore the dependency and avoid building the 
necessary symlinks.
Fulvio

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