Download iOS autotools (https://github.com/sc0rch/ios-autotools).
Download xdelta-3.0.11.tar.gz (http://xdelta.org).
brew install automake
brew install libtool
autoreconf --install
./configure
# make armv7
make clean
./iconfigure armv7
make xdelta3 CFLAGS="-DREGRESSION_TEST=0 -DNOT_MAIN=1"
ar rcs ./libxdelta3_armv7.a ./xdelta3-xdelta3.o
# make armv7s
make clean
./iconfigure armv7s
make xdelta3 CFLAGS="-DREGRESSION_TEST=0 -DNOT_MAIN=1"
ar rcs ./libxdelta3_armv7s.a ./xdelta3-xdelta3.o
# make arm64
make clean
./iconfigure arm64
make xdelta3 CFLAGS="-DREGRESSION_TEST=0 -DNOT_MAIN=1"
ar rcs ./libxdelta3_arm64.a ./xdelta3-xdelta3.o
# make x86_64
make clean
./iconfigure x86_64
make xdelta3 CFLAGS="-DREGRESSION_TEST=0 -DNOT_MAIN=1"
ar rcs ./libxdelta3_x86_64.a ./xdelta3-xdelta3.o
lipo -create ./libxdelta3_armv7.a ./libxdelta3_armv7s.a ./libxdelta3_arm64.a ./libxdelta3_x86_64.a -output ./libxdelta3.a
Add libraries to your target. Don't forget to check "Copy if needed". Also double check Library Search Path in target's build settings and remove any duplicate records.
If you have any issues, ask in comments