Port tries to upgrade unwanted package

[ballapete (Peter "Pete" Dyballa)]

Due to problems with checksums of icu docs package I asked port to

port -v upgrade boost gnutls ImageMagick iso-codes libidl poppler texlive-bin

but it has, as MS Windows or Mac OS X, its own ideas and starts to

--->  Computing dependencies for icu.
--->  Verifying checksum(s) for icu
--->  Checksumming icu4c-4_8_1-src.tgz
Error: No checksum set for icu4c-4_8_1-src.tgz
--->  Checksumming icu4c-4_8_1-docs.zip
Error: Checksum (sha1) mismatch for icu4c-4_8_1-docs.zip
Portfile checksum: icu4c-4_8_1-docs.zip sha1 6ae17be237c2db42a1a65d087d6362d1b39972ba
Distfile checksum: icu4c-4_8_1-docs.zip sha1 51f796df86f2e69c0ef1e398727a1fcb5fcbb7a3
Error: Checksum (rmd160) mismatch for icu4c-4_8_1-docs.zip
Portfile checksum: icu4c-4_8_1-docs.zip rmd160 4ba56c9aa370e9bc24235f882a5377573f5c7ad9
Distfile checksum: icu4c-4_8_1-docs.zip rmd160 bc1794f99be91b7646f13ac06a96b912a1b388f5
The correct checksum line may be:
checksums           icu4c-4_8_1-src.tgz \
                    rmd160  2196dffbc2d074cf56f5dcbb4e2b802c950cfcf0 \
                    sha256  19a4cd6e94187a03bca7514d694c5a5a666567e2884ce008ca9f14fa400af88f \
                    icu4c-4_8_1-docs.zip \
                    sha1    51f796df86f2e69c0ef1e398727a1fcb5fcbb7a3 \
                    rmd160  bc1794f99be91b7646f13ac06a96b912a1b388f5
Error: Target org.macports.checksum returned: Unable to verify file checksums
Warning: the following items did not execute (for icu): org.macports.install org.macports.checksum org.macports.extract org.macports.patch org.macports.configure org.macports.build org.macports.destroot
Log for icu is at: /opt/local/var/macports/logs/_opt_local_var_macports_sources_lil.fr.rsync.macports.org_release_ports_devel_icu/icu/main.log
Error: Unable to upgrade port: 1
To report a bug, see <http://guide.macports.org/#project.tickets>

Compilation exited abnormally with code 1 at Fri Oct 14 19:14:54

Why can't it do what I want? Is port more clever than me? 'port -v dependents boost gnutls ImageMagick iso-codes libidl poppler texlive-bin' does not list icu, so port has no right to try to update it.

Make port work correctly!

[ryandesign (Ryan Carsten Schmidt)]

boost depends on icu, so MacPorts will try to upgrade icu before letting you upgrade boost.

[ryandesign (Ryan Carsten Schmidt)]

Note that "dependents" and "dependencies" (a.k.a. "deps") are two different (and opposite) things.