inventor versus coin - coin3d/coin GitHub Wiki
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The rules for using frameworks include that the include paths must be <Frameworkname/myheader.h>. Since all Open Inventor includes are of the form #include <Inventor/xxx.h>, the framework has to be called Inventor.framework as well. (Otherwise, you would have to rewrite all your existing Open Inventor code to use <Coin/xxx.h> instead.