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I tried installing ruby 1.9.3 on Snow Leopard using:

rvm install 1.9.3 --with-gcc=clang

After installing the gcc compiler (I am running xcode 4.2). But I am getting the following make error:

/usr/bin/gcc-4.2 -dynamic -bundle -o ../../.ext/x86_64-darwin10.8.0/tcltklib.bundle stubs.o tcltklib.o -L. -L../.. -L/$ ld: in /usr/local/lib/libgcc_s.1.dylib, missing required architecture x86_64 in file for architecture x86_64 collect2: ld returned 1 exit status make[1]: *** [../../.ext/x86_64-darwin10.8.0/tcltklib.bundle] Error 1 make: *** [mkmain.sh] Error 1
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/usr/bin/gcc-4.2 is not provided in Xcode 4.2 this file might be left by older installation, try:

rvm install 1.9.3 --with-gcc=clang

Also it could be solved by uninstalling Xcode with:

/Library/Developer/Shared/uninstall-devtools rm -rf /Library/Developer/

And installing Xcode again (clean).

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4 Comments

Redownloading xcode takes a bit of time...but will get back to you when this works!
Okay, I tried this (removing and re-installing xcode with instructions above) but got this error: The provided CC(/usr/bin/gcc) is LLVM based, it is not yet fully supported by ruby and gems, please read rvm requirements
I have removed setting CC from the answer, also make sure to really read output of the rvm requirements command
I had a similar problem, but got a different error message (something about gcc and not supporting llvm), but your solution helped me, too. I just comment because I'm grateful =)

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