gistfile1.txt

--->  Configuring libid3tag
Error: Target org.macports.configure returned: configure failure: shell command " cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_audio_libid3tag/work/libid3tag-0.15.1b" && ./configure --prefix=/opt/local --disable-dependency-tracking " returned error 1
Command output: checking whether to build static libraries... yes
configure: creating libtool
---- SNIP ----
checking for compress2 in -lz... no
configure: error: libz was not found
*** You must first install zlib (libz) before you can build this package.
*** If zlib is already installed, you may need to use the LDFLAGS
*** environment variable to specify its installed location, e.g. -L<dir>.

[Users/ollie] > install zlib 
--->  Activating zlib @1.2.3_2+universal
Error: Target org.macports.activate returned: Image error: Another version of this port (zlib @1.2.3_2) is already active.
Error: Status 1 encountered during processing.