gmime doesn't build on leopard

[tannhaus@…]

I've tried everything and I get the same error every time:

gcc -dynamiclib ${wl}-flat_namespace ${wl}-undefined ${wl}suppress -o .libs/libgmime-2.0.2.2.10.dylib  .libs/gmime.o .libs/gmime-charset.o .libs/gmime-cipher-context.o .libs/gmime-common.o .libs/gmime-content-type.o .libs/gmime-data-wrapper.o .libs/gmime-disposition.o .libs/gmime-filter.o .libs/gmime-filter-basic.o .libs/gmime-filter-best.o .libs/gmime-filter-charset.o .libs/gmime-filter-crlf.o .libs/gmime-filter-enriched.o .libs/gmime-filter-from.o .libs/gmime-filter-gzip.o .libs/gmime-filter-html.o .libs/gmime-filter-md5.o .libs/gmime-filter-strip.o .libs/gmime-filter-windows.o .libs/gmime-filter-yenc.o .libs/gmime-gpg-context.o .libs/gmime-header.o .libs/gmime-iconv.o .libs/gmime-iconv-utils.o .libs/gmime-message.o .libs/gmime-message-part.o .libs/gmime-message-partial.o .libs/gmime-multipart.o .libs/gmime-multipart-encrypted.o .libs/gmime-multipart-signed.o .libs/gmime-object.o .libs/gmime-param.o .libs/gmime-parse-utils.o .libs/gmime-parser.o .libs/gmime-part.o .libs/gmime-session.o .libs/gmime-session-simple.o .libs/gmime-stream.o .libs/gmime-stream-buffer.o .libs/gmime-stream-cat.o .libs/gmime-stream-file.o .libs/gmime-stream-filter.o .libs/gmime-stream-fs.o .libs/gmime-stream-mem.o .libs/gmime-stream-mmap.o .libs/gmime-stream-null.o .libs/gmime-utils.o .libs/internet-address.o  .libs/libgmime-2.0.lax/libutil.a/cache.o .libs/libgmime-2.0.lax/libutil.a/gtrie.o .libs/libgmime-2.0.lax/libutil.a/list.o .libs/libgmime-2.0.lax/libutil.a/md5-utils.o .libs/libgmime-2.0.lax/libutil.a/memchunk.o .libs/libgmime-2.0.lax/libutil.a/url-scanner.o   -L/opt/local/lib /opt/local/lib/libgobject-2.0.dylib /opt/local/lib/libgmodule-2.0.dylib /opt/local/lib/libgthread-2.0.dylib /opt/local/lib/libglib-2.0.dylib /opt/local/lib/libintl.dylib -lz /opt/local/lib/libiconv.dylib  -install_name  /opt/local/lib/libgmime-2.0.2.dylib -Wl,-compatibility_version -Wl,5 -Wl,-current_version -Wl,5.10
ld: warning, duplicate dylib /opt/local/lib/libz.1.dylib
ld: duplicate symbol _g_bit_nth_lsf in .libs/gmime-charset.o and .libs/gmime.o

collect2: ld returned 1 exit status
make[3]: *** [libgmime-2.0.la] Error 1
make[2]: *** [all-recursive] Error 1
make[1]: *** [all-recursive] Error 1
make: *** [all] Error 2

Warning: the following items did not execute (for gmime): org.macports.activate org.macports.build org.macports.destroot org.macports.install
Error: The following dependencies failed to build: gmime gtk2 atk cairo pango Xft2 xorg-xproto xorg-util-macros gtkspell2 aspell pcre
Error: Status 1 encountered during processing.

[afb@…]

The glib issue again, see #13006