Update: I can now compile vim without any tweak on OS X 10.7.4 with Homebrew without Macports. Also check the comments from jay and jefk, which make the compilation as easy.

The default vim of Max OS X is 7.2 without +python. I need pyflakes plugins, so I have to compile it. I like using terminal, so I don’t use MacVim.

configure and make with simple options:

./configure --prefix=/usr --enable-perlinterp=yes --enable-pythoninterp=yes --with-features=huge
make

I got such error:

Undefined symbols for architecture x86_64:
"_iconv", referenced from:
_buf_write_bytes in fileio.o
_readfile in fileio.o
_my_iconv_open in mbyte.o
_string_convert_ext in mbyte.o
(maybe you meant: _my_iconv_open)
"_iconv_close", referenced from:
_buf_write in fileio.o
_readfile in fileio.o
_my_iconv_open in mbyte.o
_convert_setup_ext in mbyte.o
"_iconv_open", referenced from:
_my_iconv_open in mbyte.o
(maybe you meant: _my_iconv_open)
ld: symbol(s) not found for architecture x86_64
collect2: ld returned 1 exit status
make[1]: *** [vim] Error 1
make: *** [first] Error 2

From google, I know that libiconv from macports doesn’t support x86_64.
Update: Thanks to jay’s remind, the libiconv comes with system should be fine. So, to specify the library, use the following to configure

LDFLAGS=-L/usr/lib ./configure --enable-perlinterp=yes --enable-pythoninterp=yes --with-features=huge

The solution is to download and compile and install libiconv. Download from http://www.gnu.org/software/libiconv/, compile and make & make install

CFLAGS='-arch i386 -arch x86_64' CCFLAGS='-arch i386 -arch x86_64' CXXFLAGS='-arch i386 -arch x86_64' ./configure
make
sudo make install

After install, it should be OK to compile vim. But I failed, and spent a whole afternoon. Finally, I removed the src, and use “hg up -C” to recover to get a clean copy, and then succeed! Amazing, maybe there were some “cache” files to record the old libiconv library path. Anyway, I could use vim7.3 in Mac OS X with +python now.

Update: Just remove all files exclude configure in src/auto, and reconfigure without cache.
Update: It works on Lion, too.