fatal error: 'absl/types/optional.h' file not found

[jeckymodi]

I had followed documentation for installation of Mediasoup ios.

https://github.com/ethand91/mediasoup-ios-client/blob/master/documentation/Installation.md

I had followed following commands to create .a framework of mediasoup but I am getting error like fatal error: 'absl/types/optional.h' file not found

cd /Users/jitendra/Documents/Projects/mediasoup-ios-client/mediasoup-client-ios/dependencies
jitendra@Aub-17-Saurav-Mac-mini dependencies % cmake . -Bbuild -DLIBWEBRTC_INCLUDE_PATH=/Users/jitendra/Documents/Projects/mediasoup-ios-client/mediasoup-client-ios/dependencies/webrtc/src -DLIBWEBRTC_BINARY_PATH=/Users/jitendra/Documents/Projects/mediasoup-ios-client/mediasoup-client-ios/dependencies/webrtc/src/out_ios_libs/universal -DMEDIASOUP_LOG_DEV=ON -DCMAKE_CXX_FLAGS="-fvisibility=hidden" -DLIBSDPTRANSFORM_BUILD_TESTS=OFF -DIOS_SDK=iphone -DIOS_ARCHS="arm64"

This is the output for above command

CMake Warning (dev) in CMakeLists.txt:
  No project() command is present.  The top-level CMakeLists.txt file must
  contain a literal, direct call to the project() command.  Add a line of
  code such as

    project(ProjectName)

  near the top of the file, but after cmake_minimum_required().

  CMake is pretending there is a "project(Project)" command on the first
  line.
This warning is for project developers.  Use -Wno-dev to suppress it.

-- The C compiler identification is AppleClang 12.0.5.12050022
-- The CXX compiler identification is AppleClang 12.0.5.12050022
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- 
========== libmediasoupclient iOS Build Configuration ==========

-- CMAKE_OSX_SYSROOT             = /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/
-- CMAKE_OSX_ARCHITECTURES       = arm64

=========== libmediasoupclient Build Configuration ===========

-- MEDIASOUPCLIENT_BUILD_TESTS : OFF
-- MEDIASOUPCLIENT_LOG_TRACE   : OFF
-- MEDIASOUPCLIENT_LOG_DEV     : OFF
-- LIBWEBRTC_INCLUDE_PATH      : /Users/jitendra/Documents/Projects/mediasoup-ios-client/mediasoup-client-ios/dependencies/webrtc/src
-- LIBWEBRTC_BINARY_PATH       : /Users/jitendra/Documents/Projects/mediasoup-ios-client/mediasoup-client-ios/dependencies/webrtc/src/out_ios_libs/universal

-- Configuring done
-- Generating done
CMake Warning:
  Manually-specified variables were not used by the project:

    MEDIASOUP_LOG_DEV


-- Build files have been written to: /Users/jitendra/Documents/Projects/mediasoup-ios-client/mediasoup-client-ios/dependencies/build

After that I tried to fire this command

make -C build

I am getting following error.

[  4%] Building CXX object libmediasoupclient/libsdptransform/CMakeFiles/sdptransform.dir/src/grammar.cpp.o
clang: warning: using sysroot for 'iPhoneOS' but targeting 'MacOSX' [-Wincompatible-sysroot]
[  8%] Building CXX object libmediasoupclient/libsdptransform/CMakeFiles/sdptransform.dir/src/parser.cpp.o
clang: warning: using sysroot for 'iPhoneOS' but targeting 'MacOSX' [-Wincompatible-sysroot]
[ 12%] Building CXX object libmediasoupclient/libsdptransform/CMakeFiles/sdptransform.dir/src/writer.cpp.o
clang: warning: using sysroot for 'iPhoneOS' but targeting 'MacOSX' [-Wincompatible-sysroot]
[ 16%] Linking CXX static library libsdptransform.a
[ 16%] Built target sdptransform
[ 20%] Building CXX object libmediasoupclient/CMakeFiles/mediasoupclient.dir/src/Consumer.cpp.o
clang: warning: using sysroot for 'iPhoneOS' but targeting 'MacOSX' [-Wincompatible-sysroot]
In file included from /Users/jitendra/Documents/Projects/mediasoup-ios-client/mediasoup-client-ios/dependencies/libmediasoupclient/src/Consumer.cpp:3:
In file included from /Users/jitendra/Documents/Projects/mediasoup-ios-client/mediasoup-client-ios/dependencies/libmediasoupclient/include/Consumer.hpp:5:
/Users/jitendra/Documents/Projects/mediasoup-ios-client/mediasoup-client-ios/dependencies/webrtc/src/api/media_stream_interface.h:24:10: fatal error: 'absl/types/optional.h' file not found
#include "absl/types/optional.h"
         ^~~~~~~~~~~~~~~~~~~~~~~
1 error generated.
make[2]: *** [libmediasoupclient/CMakeFiles/mediasoupclient.dir/src/Consumer.cpp.o] Error 1
make[1]: *** [libmediasoupclient/CMakeFiles/mediasoupclient.dir/all] Error 2
make: *** [all] Error 2

Any help would be appereciated.

[mythkiven]

I have the same problem

[jeckymodi]

I resolve this issue by adding that dependency but now I got new error as I posted after this issue.

[foxchen2000]

Copying webrtc/src/third_party to the destination folder solves the problem.