___isOSVersionAtLeast is undefined. How I spent several days compiling curl and linking it.
I use Kotlin/Native to create a tiny command line utility for Windows, Linux, and macOS. I believe the best app is the app without dependencies, and thus without requirements and dependencies hassle. That is easier than baking os-specific packages or installers.
It failed with something cryptic on my macOS 10.13:
Undefined symbols for architecture x86_64: "___isOSVersionAtLeast", referenced from: _singleipconnect in libcurl.a(libcurl_la-connect.o) _darwinssl_connect_common in libcurl.a(libcurl_la-darwinssl.o) _darwinssl_version_from_curl in libcurl.a(libcurl_la-darwinssl.o) ld: symbol(s) not found for architecture x86_64
Digging internet did not help. And that is mostly why I am blogging that one. Changing or patching the way I build curl was useless too. Nikolay suggested me to check target version of my binaries. That was it. Kudos Nikolay!
I should have compiled the curl with
10.13 as min version for Mac. I did that by setting
CFLAGS environment variable to