Depending on dev-java/icedtea-bin[X]

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Hi folks,

I've got an ebuild that can install HDFView [1], which needs an X
interface.  My package depends on java via `virtual/jre` and
`virtual/jdk`, which eventually result in pulling in
`dev-java/icedtea-bin`.  However, I do not have the `X` USE flag
enabled globally on my system, so icedtea-bin does not pull in
`x11-libs/libXtst`, which leads to:

  Exception in thread "main" java.lang.UnsatisfiedLinkError:
    /opt/icedtea6-bin-1.10.4/jre/lib/i386/xawt/libmawt.so:
      libXtst.so.6: cannot open shared object file:
  No such file or directory
          ...
          at java.awt.Component.<clinit>(Component.java:582)
  Could not find the main class: ncsa.hdf.view.HDFView. Program will exit.

I could add something like:

  hdfview? ( dev-java/icedtea-bin[X] )

to my dependencies, but that would make life difficult for users who
use other Java implementations.  It seems to me that the virtual Java
packages should expose the union of USE flags from the underlying
implementations, but perhaps I am just missing something.

So, what's the best way to fix this?

Thanks,
Trevor

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