How is McCain able to constitutionally run for the presidency?

Unsure if this has been asked here before.
Th U.S. Constitution is clear on the point that the president must be born in the country. Although I won’t be voting for McCain, I do think that there should be an amendment allowing people born citizens, or perhaps even naturalized citizens to run. However, as there isn’t one yet, and as John McCain was born in Panamá, what gives?