ImageMagick install fails w/ zlib error

[dorfman@…]

I'm new to MacPorts, but I don't think I'm doing anything unusual. I have a fresh install of MacPorts 1.6, for the sole purpose (at this point) of installing ImageMagick. I am getting a failure indicating that I do not have zlib, although it does appear in 'port installed'.

I have literally done nothing but install MacPorts and then issue the following command:

sudo port install tiff -macosx imagemagick +q8 +gs +wmf

(which I got from here: ​http://rmagick.rubyforge.org/install-osx.html)

Here is the error message I'm getting:

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_graphics_tiff/work/tiff-3.8.2" && ./configure --prefix=/opt/local --mandir=/opt/local/share/man --with-docdir=/opt/local/share/doc/tiff-3.8.2 --with-jpeg-include-dir=/opt/local/include --with-jpeg-lib-dir=/opt/local/lib --with-zlib-include-dir=/opt/local/include --with-zlib-lib-dir=/opt/local/lib " returned error 1 Command output: checking for int... yes checking size of int... 4 checking for long... yes checking size of long... 4 checking whether time.h and sys/time.h may both be included... yes checking whether struct tm is in sys/time.h or time.h... time.h checking for int8... no checking for int16... no checking for int32... no checking for floor... yes checking for isascii... yes checking for memmove... yes checking for memset... yes checking for mmap... yes checking for pow... yes checking for sqrt... yes checking for strchr... yes checking for strrchr... yes checking for strstr... yes checking for strtol... yes checking for getopt... yes checking for strcasecmp... yes checking for strtoul... yes checking for lfind... yes checking native cpu bit order... lsb2msb checking for special C compiler options needed for large files... no checking for _FILE_OFFSET_BITS value needed for large files... no checking for _LARGE_FILES value needed for large files... no checking for inflateEnd in -lz... no configure: error: Zlib library not found at /opt/local/lib

Error: Status 1 encountered during processing.