Checking Xcode installation for macOS systems
Until now, during the configure step it was checked if the host Operative System were GNU/Linux, and if not, we assumed it is macOS. However, it can be any other different OS! With this commit, now we explicity check if the system is GNU/Linux or Darwin (macOS). If it is not any of them, a warning message says to the user that the host system is different from which we have checked so far (and invite to contact us if there is any problem). In addition to this, if the system is macOS, now it checks if Xcode is already installed in the host system. If it is not installed, a warning message informs the user to do that in case a problem/crash in the configure step occurs. We have found that it is convenient to have Xcode installed in order to avoid some problems.
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