PocketSocket does not link on Xcode 10.1 #81
Description
In a MacOS project newly created in Xcode 10.1, PocketSocket compilation throws a linker error:
Ld /Users/me/Library/Developer/Xcode/DerivedData/Whatever-arieyrqotbvrbncuwgmbqurigkkv/Build/Products/Debug/Whatever.app/Contents/MacOS/Whatever normal x86_64 (in target: Whatever)
cd /Users/me/Desktop/Whatever
export MACOSX_DEPLOYMENT_TARGET=10.13
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -arch x86_64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk -L/Users/me/Library/Developer/Xcode/DerivedData/Whatever-arieyrqotbvrbncuwgmbqurigkkv/Build/Products/Debug -L/Users/me/Library/Developer/Xcode/DerivedData/Whatever-arieyrqotbvrbncuwgmbqurigkkv/Build/Products/Debug/PocketSocket -F/Users/me/Library/Developer/Xcode/DerivedData/Whatever-arieyrqotbvrbncuwgmbqurigkkv/Build/Products/Debug -filelist /Users/me/Library/Developer/Xcode/DerivedData/Whatever-arieyrqotbvrbncuwgmbqurigkkv/Build/Intermediates.noindex/Whatever.build/Debug/Whatever.build/Objects-normal/x86_64/Whatever.LinkFileList -Xlinker -rpath -Xlinker @executable_path/../Frameworks -mmacosx-version-min=10.13 -Xlinker -object_path_lto -Xlinker /Users/me/Library/Developer/Xcode/DerivedData/Whatever-arieyrqotbvrbncuwgmbqurigkkv/Build/Intermediates.noindex/Whatever.build/Debug/Whatever.build/Objects-normal/x86_64/Whatever_lto.o -Xlinker -export_dynamic -Xlinker -no_deduplicate -fobjc-arc -fobjc-link-runtime -ObjC -lPocketSocket -lsystem -lz -framework CFNetwork -framework Foundation -framework Security -lPods-Whatever -Xlinker -dependency_info -Xlinker /Users/me/Library/Developer/Xcode/DerivedData/Whatever-arieyrqotbvrbncuwgmbqurigkkv/Build/Intermediates.noindex/Whatever.build/Debug/Whatever.build/Objects-normal/x86_64/Whatever_dependency_info.dat -o /Users/me/Library/Developer/Xcode/DerivedData/Whatever-arieyrqotbvrbncuwgmbqurigkkv/Build/Products/Debug/Whatever.app/Contents/MacOS/Whatever
ld: library not found for -lsystem
clang: error: linker command failed with exit code 1 (use -v to see invocation)