port install -f <port> does not force copying or rebuilding of package

[nelson.ferreira@…]

neumann:~ root# port -d install libpng DEBUG: Changing to port directory: /opt/local/var/macports/sources/rsync.macports.org/release/tarballs/ports/graphics/libpng DEBUG: OS darwin/11.2.0 (Mac OS X 10.7) arch i386 DEBUG: org.macports.load registered provides 'load', a pre-existing procedure. Target override will not be provided DEBUG: org.macports.unload registered provides 'unload', a pre-existing procedure. Target override will not be provided DEBUG: org.macports.distfiles registered provides 'distfiles', a pre-existing procedure. Target override will not be provided DEBUG: Using group file /opt/local/var/macports/sources/rsync.macports.org/release/tarballs/ports/_resources/port1.0/group/archcheck-1.0.tcl DEBUG: adding the default universal variant DEBUG: Reading variant descriptions from /opt/local/var/macports/sources/rsync.macports.org/release/tarballs/ports/_resources/port1.0/variant_descriptions.conf DEBUG: Attempting ln -sf /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_graphics_libpng/libpng/work /opt/local/var/macports/sources/rsync.macports.org/release/tarballs/ports/graphics/libpng/work DEBUG: changing euid/egid - current euid: 0 - current egid: 0 DEBUG: egid changed to: 501 DEBUG: euid changed to: 502 DEBUG: Starting logging for libpng ---> Computing dependencies for libpng DEBUG: Searching for dependency: zlib DEBUG: Found Dependency: receipt exists for zlib DEBUG: Skipping activate (libpng @1.4.8_0) since this port is already active DEBUG: Executing org.macports.main (libpng) DEBUG: clean phase started at Thu Dec 15 22:15:47 EST 2011 ---> Cleaning libpng DEBUG: Executing org.macports.clean (libpng) ---> Removing work directory for libpng DEBUG: Removing directory: /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_graphics_libpng/libpng DEBUG: delete: /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_graphics_libpng/libpng DEBUG: No work directory found to remove at /var/root/.macports/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_graphics_libpng/libpng DEBUG: Removing symlink: /opt/local/var/macports/sources/rsync.macports.org/release/tarballs/ports/graphics/libpng/work DEBUG: delete: /opt/local/var/macports/sources/rsync.macports.org/release/tarballs/ports/graphics/libpng/work DEBUG: Removing directory: /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_graphics_libpng/libpng DEBUG: delete: /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_graphics_libpng/libpng

neumann:~ root# port -d install -f libpng DEBUG: Changing to port directory: /opt/local/var/macports/sources/rsync.macports.org/release/tarballs/ports/graphics/libpng DEBUG: OS darwin/11.2.0 (Mac OS X 10.7) arch i386 DEBUG: org.macports.load registered provides 'load', a pre-existing procedure. Target override will not be provided DEBUG: org.macports.unload registered provides 'unload', a pre-existing procedure. Target override will not be provided DEBUG: org.macports.distfiles registered provides 'distfiles', a pre-existing procedure. Target override will not be provided DEBUG: Using group file /opt/local/var/macports/sources/rsync.macports.org/release/tarballs/ports/_resources/port1.0/group/archcheck-1.0.tcl DEBUG: adding the default universal variant DEBUG: Reading variant descriptions from /opt/local/var/macports/sources/rsync.macports.org/release/tarballs/ports/_resources/port1.0/variant_descriptions.conf DEBUG: Starting logging for libpng ---> Computing dependencies for libpng DEBUG: Searching for dependency: zlib DEBUG: Found Dependency: receipt exists for zlib DEBUG: Skipping activate (libpng @1.4.8_0) since this port is already active DEBUG: Executing org.macports.main (libpng) DEBUG: clean phase started at Thu Dec 15 22:15:58 EST 2011 ---> Cleaning libpng DEBUG: Executing org.macports.clean (libpng) ---> Removing work directory for libpng DEBUG: No work directory found to remove at /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_graphics_libpng/libpng DEBUG: No work directory found to remove at /var/root/.macports/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_graphics_libpng/libpng DEBUG: Removing directory: /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_graphics_libpng/libpng DEBUG: delete: /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_graphics_libpng/libpng