I believe you still need to setup/install vcpkg. Did you find https://github.com/openziti/ziti-sdk-c/blob/main/BUILD.md and did you set VCPKG_ROOT
?
I made a supershort example set of 'how to get it to build' over on this post too:
I just tried it now and it "works on my machine" (famous last words, I know!)
Basically boils down to this (copy/pasted from that post). Obviously change the paths...:
export VCPKG_ROOT=/path/to/where/you/want/to/put/vcpkg
mkdir -p $VCPKG_ROOT
git clone git@github.com:microsoft/vcpkg.git $VCPKG_ROOT
sudo apt install zip -y
sudo apt-get install pkg-config -y
$VCPKG_ROOT/bootstrap-vcpkg.sh
cd /to/wherever/you/have/ziti-tunnel-sdk-c/
mkdir build
cd build
cmake --preset ci-linux-x64 ..
cmake build .