Building MacVim on Mac OS X

Here are some instructions:
https://github.com/b4winckler/macvim/wiki/Building

The problem that I stumbled upon was the errors with libicon:
Undefined symbols for architecture x86_64:"_iconv", referenced from: ........

The libicon on the system is not compiled for 64bit by default.
To fix this you need to get the latest libiconv-1.14:
http://www.gnu.org/software/libiconv/#downloading

Configure it with:
CFLAGS='-arch i386 -arch x86_64' CCFLAGS='-arch i386 -arch x86_64' CXXFLAGS='-arch i386 -arch x86_64' ./configure
then >  make && make install

After that you can get the MacVim source code and build it fine, got 7.3.401 now.