library not found for -lcrt0.o when building on mac

[Caleb Whiting <yskywalker at icloud dot com>]

Hi all,

Iâm trying to use crosstool-ng to build a toolchain for my mac to 
cross-compile ffmpeg for my Raspberry Pi.  Iâm new here, but my 
understanding is that this is the place to come to ask for help.

Being new here, I run the risk of coming across like a help vampire who 
expects everyone else to do the work for me.  I really donât want to 
be that type of person, but my ignorance puts me at risk for doing it in 
spite of myself.

So far my experience with ct-ng has been very good.  Iâve ran into 
many, many errors through this whole process but Iâve always been able 
to fix them by googling and then patching some source file or installing 
a missing tool.  So far Iâve been able to compile ct-ng, configure it, 
but things are failing at the `ct-ng build` step and I just canât seem 
to figure out what the problem is.  So Iâm resorting to ask for 
help/suggestions.  Here is the tail end of my build.log:

> [DEBUG]  Checking that gcc can compile a trivial program
> [DEBUG]    ==> Executing: 'x86_64-build_apple-darwin14.3.0-gcc' '-O2' 
> '-g' '-pipe' 
> '/Volumes/crosstool-ng/ctng/.build/arm-unknown-linux-gnueabi/build/test.c' 
> '-o' 
> '/Volumes/crosstool-ng/ctng/.build/arm-unknown-linux-gnueabi/build/.gccout'
> [DEBUG]  Checking that gcc can compile a trivial program: done in 
> 1.00s (at 00:08)
> [DEBUG]  
> =================================================================
> [DEBUG]  Checking that gcc can compile a trivial statically linked 
> program (CT_WANTS_STATIC_LINK)
> [DEBUG]    You may need to ensure that static libraries such as libc.a 
> are installed on your system
> [DEBUG]    ==> Executing: 'x86_64-build_apple-darwin14.3.0-gcc' '-O2' 
> '-g' '-pipe' 
> '/Volumes/crosstool-ng/ctng/.build/arm-unknown-linux-gnueabi/build/test.c' 
> '-static' '-o' 
> '/Volumes/crosstool-ng/ctng/.build/arm-unknown-linux-gnueabi/build/.gccout'
> [DEBUG]    ld: library not found for -lcrt0.o
> [ERROR]    clang: error: linker command failed with exit code 1 (use 
> -v to see invocation)

Iâm running Mac OS 10.10.3 with command line dev tools installed.  
(But not Xcode itself.)

Thanks,
Caleb Whiting

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