[yocto] How to find out the rdepends of certain package

[John Rama]

Hi, experts

I'm facing following problem, when building a image.

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The following packages have unmet dependencies:
 openssh-dev : Depends: openssh (= 7.1p2-r0.0) but it is not going to be installed
               Recommends: openssh-misc-dev but it is not installable
               Recommends: shadow-sysroot-dev but it is not installable
               Recommends: libcrypto-dev but it is not installable
               Recommends: openssh-sshd-dev but it is not installable
               Recommends: update-alternatives-opkg-dev but it is not installable
               Recommends: openssh-scp-dev but it is not installable
               Recommends: openssh-ssh-dev but it is not installable
               Recommends: openssh-sftp-server-dev but it is not installable
               Recommends: openssh-keygen-dev but it is not installable
               Recommends: openssh-sftp-dev but it is not installable
E: Unable to correct problems, you have held broken packages.
--------------------------------------------------------

I know this can be resolved by adding "openssh" to the IMAGE_INSTALL_append list.

But, I'm very curious which recipes try to use openssh-dev, or
which package depends on openssh-dev.

1. I just greped entire recipe tree with "openssh-dev", but there is no hit.
2. Run bitbake -g <image> option to generate the *-depends.dot file,
   then grepped with "openssh-dev", two hits. 
 
   package-depends.dot:31228:"openssh-staticdev" -> "openssh-dev" [style=dashed]
   pn-depends.dot:4474:"openssh" -> "openssh-dev" [style=dashed]

  However, these are not used by using the similiar method of #1 and #2.

Is there any good way to find out why openssh-dev is in the installed package list ?

John