5.3 building for old macOS fails with gcc
5.4 build for iOS simulator on macOS 13.2 with Xcode 14
5.5 cannot handle Unicode arguments in non-Unicode builds on Windows
+ 5.6 cygwin: make install installs curl-config.1 twice
5.9 Utilize Requires.private directives in libcurl.pc
5.11 configure --with-gssapi with Heimdal is ignored on macOS
5.12 flaky CI builds
https://curl.se/bug/?i=731
https://curl.se/bug/?i=3747
+5.6 cygwin: make install installs curl-config.1 twice
+
+ https://github.com/curl/curl/issues/8839
+
5.9 Utilize Requires.private directives in libcurl.pc
https://github.com/curl/curl/issues/864