Simlar is a cross platform VoIP App aiming to make ZRTP encrypted calls easy.
simlar-ios uses CocoaPods to manage its dependencies. Download them with:
pod install
In order to update libs handled by CocoaPods run:
pod update
After downloading dependencies, simply import simlar-ios in XCode.
Simlar heavily depends on liblinphone. Since version 4.2 it is available as Pod. However if you would like to compile it yourself, you should start with compiling linphone-sdk for iOS. Please follow the build instructions there. Once you have managed to compile linphone-iphone on your system, here is a script for checking out, applying Simlar patches, compile and integrate liblinphone into simlar-ios.
./bootstrap-liblinphone.sh origin/master
Simlar uses post quantum encryption since version 2.6 as liblinphone supports it since version 5.2. However the liblinphone artifacts published in the maven repository do not support it. So you have to build it yourself.