First, you'll need to set up the toolchain. Personally I use 0.3 (which is the newest version at time of writing), any other and you might have to do some manual modifications to the build process.
Then, set up any of the external libs you might want. Meaning libMAD for MP3 playback, libFLAC for FLAC support and/or Tremor for Ogg support. You can add mpeg2dec as well, but it's only used for MPEG2 BS1/2 cutscene support and you really should be using the DXA versions instead (can be downloaded from ScummVM's download page.
Note that you only need to add these if you need support for those filetypes, ScummVM will run fine without them.
The below script is what I use to configure these libraries:
#!/bin/bash export CC='/usr/local/bin/arm-apple-darwin-gcc -v' export CXX='/usr/local/bin/arm-apple-darwin-g++' export LD=$CC export LDFLAGS="-L/usr/local/arm-apple-darwin/lib/ -Wl,-lstdc++,-lgcc_s.1" ./configure --host=arm-darwin --prefix=/usr/local/arm-apple-darwin/
After that, 'make' and 'make install' should do the trick.
Then, we need to configure ScummVM itself.
Below is the script I use for this:
#!/bin/bash export CC='/usr/local/bin/arm-apple-darwin-gcc -v' export CXX='/usr/local/bin/arm-apple-darwin-g++' export LD=$CC export LDFLAGS="-L/usr/local/arm-apple-darwin/lib/ -Wl,-lstdc++,-lgcc_s.1" export CXXFLAGS="-Wl,-lstdc++,-lgcc_s.1 -I/usr/local/arm-apple-darwin/include/" export OBJCFLAGS="-I/usr/local/arm-apple-darwin/include/" ./configure --host=iphone --disable-mt32emu --disable-scalers --enable-release --with-flac-prefix=/usr/local/arm-apple-darwin/
Note that the --with-flac-prefix is only necessary if you want to include FLAC support.
If you've installed the external libs in any other place than /usr/local/arm-apple/darwin, you need to tell ScummVM where to find them at this point as well (additional flags to ./configure).
First, you need to specify which assembler to use, since ScummVM's configure system currently doesn't do this automatically for us.
Then, we can start the compile:
Lastly, we want to make a ScummVM.app bundle:
Then simply upload the whole ScummVM.app directory to your device under the /Applications folder, and you're done!