sudo port install zlib fails on Snow Leopard

[glmuelle@…]

Running "sudo port install zlib" on mac os 10.6.2 fails with the following error message:

Portfile changed since last build; discarding previous state.
--->  Computing dependencies for zlib
Portfile changed since last build; discarding previous state.
--->  Fetching zlib
Portfile changed since last build; discarding previous state.
--->  Verifying checksum(s) for zlib
Portfile changed since last build; discarding previous state.
--->  Extracting zlib
Portfile changed since last build; discarding previous state.
--->  Applying patches to zlib
Error: Target org.macports.patch returned: shell command " cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_archivers_zlib/work/zlib-1.2.3" && /usr/bin/patch -p0 < '/opt/local/var/macports/sources/rsync.macports.org/release/ports/archivers/zlib/files/patch-Makefile-static.diff'" returned error 1
Command output: sh: line 0: cd: /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_archivers_zlib/work/zlib-1.2.3: No such file or directory

Error: Status 1 encountered during processing.
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