Building DynCall on Mac OS X
============================
The build system supports universal binaries (including static libraries) by
default (i386, x86_64).
In addition, the desired SDK can be choosen.
Optional configure switches for Mac OS X:
  Operating System:
    --target=MacOSX (optional, auto-detect)
  SDK:
    --sdk=<version> (optional, auto-detect)
  Architecture:
    not specified, builds universal binaries depending on SDK version
Configure and build for host platform:
  ./configure
  make
  sudo make install
Compile for Mac OS X 10.4u:
  configure --target=MacOSX --sdk=10.4u