So, Using the code as well as the compilers I have attempted (see unique issue), the more than likely explanation for it compiling ok without the consist of is that other headers I've bundled have themselves bundled the library? @Oriol thank you for your comment. It can be true https://directoryecho.com/listings1052766/5-easy-facts-about-post-malone-i-had-some-help-cover-song-described