I've got a Swift Lambda made for AWS. I can run it in Xcode locally or deploy to AWS using Docker and the Docker build script. If I add URLSession() to my code, I can still run it locally via Xcode, but the Docker build breaks: [35/36] Compiling HelloWorld main.swift /usr/bin/ld.gold: error: cannot find -lcurl /usr/lib/swift_static/linux/libCFURLSessionInterface.a(CFURLSessionInterface.c.o):CFURLSessionInterface.c:function CFURLSessionEasyCodeDescription: error: undefined reference to 'curl_easy_strerror' /usr/lib/swift_static/linux/libCFURLSessionInterface.a(CFURLSessionInterface.c.o):CFURLSessionInterface.c:function CFURLSessionEasyHandleInit: error: undefined reference to 'curl_easy_init' /usr/lib/swift_static/linux/libCFURLSessionInterface.a(CFURLSessionInterface.c.o):CFURLSessionInterface.c:function CFURLSessionEasyHandleDeinit: error: undefined reference to 'curl_easy_cleanup' /usr/lib/swift_static/linux/libCFURLSessionInterface.a(CFURLSessionInterface.c.o):CFURLSessionInterface.c:function CFURLSessionEasyHandleSetPauseState: error: undefined reference to 'curl_easy_pause' /usr/lib/swift_static/linux/libCFURLSessionInterface.a(CFURLSessionInterface.c.o):CFURLSessionInterface.c:function CFURLSessionMultiHandleInit: error: undefined reference to 'curl_multi_init' /usr/lib/swift_static/linux/libCFURLSessionInterface.a(CFURLSessionInterface.c.o):CFURLSessionInterface.c:function CFURLSessionMultiHandleDeinit: error: undefined reference to 'curl_multi_cleanup' /usr/lib/swift_static/linux/libCFURLSessionInterface.a(CFURLSessionInterface.c.o):CFURLSessionInterface.c:function CFURLSessionMultiHandleAddHandle: error: undefined reference to 'curl_multi_add_handle' /usr/lib/swift_static/linux/libCFURLSessionInterface.a(CFURLSessionInterface.c.o):CFURLSessionInterface.c:function CFURLSessionMultiHandleRemoveHandle: error: undefined reference to 'curl_multi_remove_handle' /usr/lib/swift_static/linux/libCFURLSessionInterface.a(CFURLSessionInterface.c.o):CFURLSessionInterface.c:function CFURLSessionMultiHandleAssign: error: undefined reference to 'curl_multi_assign' /usr/lib/swift_static/linux/libCFURLSessionInterface.a(CFURLSessionInterface.c.o):CFURLSessionInterface.c:function CFURLSessionMultiHandleAction: error: undefined reference to 'curl_multi_socket_action' /usr/lib/swift_static/linux/libCFURLSessionInterface.a(CFURLSessionInterface.c.o):CFURLSessionInterface.c:function CFURLSessionMultiHandleInfoRead: error: undefined reference to 'curl_multi_info_read' /usr/lib/swift_static/linux/libCFURLSessionInterface.a(CFURLSessionInterface.c.o):CFURLSessionInterface.c:function CFURLSession_easy_setopt_ptr: error: undefined reference to 'curl_easy_setopt' /usr/lib/swift_static/linux/libCFURLSessionInterface.a(CFURLSessionInterface.c.o):CFURLSessionInterface.c:function CFURLSession_easy_setopt_int: error: undefined reference to 'curl_easy_setopt' /usr/lib/swift_static/linux/libCFURLSessionInterface.a(CFURLSessionInterface.c.o):CFURLSessionInterface.c:function CFURLSession_easy_setopt_long: error: undefined reference to 'curl_easy_setopt' /usr/lib/swift_static/linux/libCFURLSessionInterface.a(CFURLSessionInterface.c.o):CFURLSessionInterface.c:function CFURLSession_easy_setopt_int64: error: undefined reference to 'curl_easy_setopt' /usr/lib/swift_static/linux/libCFURLSessionInterface.a(CFURLSessionInterface.c.o):CFURLSessionInterface.c:function CFURLSession_easy_getinfo_long: error: undefined reference to 'curl_easy_getinfo' /usr/lib/swift_static/linux/libCFURLSessionInterface.a(CFURLSessionInterface.c.o):CFURLSessionInterface.c:function CFURLSession_easy_getinfo_double: error: undefined reference to 'curl_easy_getinfo' /usr/lib/swift_static/linux/libCFURLSessionInterface.a(CFURLSessionInterface.c.o):CFURLSessionInterface.c:function CFURLSession_easy_getinfo_charp: error: undefined reference to 'curl_easy_getinfo' /usr/lib/swift_static/linux/libCFURLSessionInterface.a(CFURLSessionInterface.c.o):CFURLSessionInterface.c:function CFURLSession_multi_setopt_ptr: error: undefined reference to 'curl_multi_setopt' /usr/lib/swift_static/linux/libCFURLSessionInterface.a(CFURLSessionInterface.c.o):CFURLSessionInterface.c:function CFURLSession_multi_setopt_l: error: undefined reference to 'curl_multi_setopt' /usr/lib/swift_static/linux/libCFURLSessionInterface.a(CFURLSessionInterface.c.o):CFURLSessionInterface.c:function CFURLSession_multi_setopt_sf: error: undefined reference to 'curl_multi_setopt' /usr/lib/swift_static/linux/libCFURLSessionInterface.a(CFURLSessionInterface.c.o):CFURLSessionInterface.c:function CFURLSession_multi_setopt_tf: error: undefined reference to 'curl_multi_setopt' /usr/lib/swift_static/linux/libCFURLSessionInterface.a(CFURLSessionInterface.c.o):CFURLSessionInterface.c:function CFURLSessionInit: error: undefined reference to 'curl_global_init' /usr/lib/swift_static/linux/libCFURLSessionInterface.a(CFURLSessionInterface.c.o):CFURLSessionInterface.c:function CFURLSessionCurlVersionString: error: undefined reference to 'curl_version' /usr/lib/swift_static/linux/libCFURLSessionInterface.a(CFURLSessionInterface.c.o):CFURLSessionInterface.c:function CFURLSessionCurlVersionInfo: error: undefined reference to 'curl_version_info' /usr/lib/swift_static/linux/libCFURLSessionInterface.a(CFURLSessionInterface.c.o):CFURLSessionInterface.c:function CFURLSessionSListAppend: error: undefined reference to 'curl_slist_append' /usr/lib/swift_static/linux/libCFURLSessionInterface.a(CFURLSessionInterface.c.o):CFURLSessionInterface.c:function CFURLSessionSListFreeAll: error: undefined reference to 'curl_slist_free_all' clang-10: error: linker command failed with exit code 1 (use -v to see invocation) <unknown>:0: error: link command failed with exit code 1 (use -v to see invocation) [35/36] Linking HelloWorld I am using this build script: docker run \     --rm \     --volume "$(pwd)/:/src" \     --workdir "/src/" \     swift:5.3.1-amazonlinux2 \     swift build --product HelloWorld -c release -Xswiftc -static-stdlib I've also tried 5.4.3 and 5.5.0 -amazonlinux2, but they each give a different set of errors. How do I get around this?