I am also facing same issue, I have tried many things but unable to resolve. I Also tried following script after pod install. But following issues are there - Then i got 'Stored properties cannot be marked unavailable with @available' in one pod, I removed these lines to silence this exception. Then some pods (SwiftSoup, Starscream, PromiseKit) gave me different errors, that I avoided with changing their min iOS version to 14.0. And finally I stuck with two errors: 'Undefined symbols' and 'Linker command failed with exit code 1'. None of them give me any info or show me the exact place of error. installer.aggregate_targets.each do |target| target.xcconfigs.each do |variant, xcconfig| xcconfig_path = target.client_root + target.xcconfig_relative_path(variant) IO.write(xcconfig_path, IO.read(xcconfig_path).gsub("DT_TOOLCHAIN_DIR", "TOOLCHAIN_DIR")) end end installer.pods_project.targets.each do |target| target.build_configurations.each do |config| if config.base_configuration_reference.is_a? Xcodeproj::Project::Object::PBXFileReference xcconfig_path = config.base_configuration_reference.real_path IO.write(xcconfig_path, IO.read(xcconfig_path).gsub("DT_TOOLCHAIN_DIR", "TOOLCHAIN_DIR")) end end end