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I ran into this little snag after my Mac upgraded to El Capitan ... probably didn't properly upgrade XCode or whatever.
Anyhow ... when compiling my application, I would get this message and the linking would fail:
file not found: /usr/lib/crt1.o
This message basically hints to the fact that the so called "command line tools" of XCode are not installed.
First off, go to the App Store and make sure you have the latest XCode installed.
Next, open a Terminal window and execute:
xcode-select --install
After installation completed, try compiling and linking again, it should now work.
