> I am trying to install the gap_packages in my sage installation so that I > can construct the McLaughlinGraph which uses the design package of GAP. > > I tried the instructions mentioned here: > http://wiki.sagemath.org/InstallingGapPackages, and got the following > error, > > " > > checking whether the C compiler (gcc ) works... no > > configure: error: installation or configuration problem: C compiler cannot > create executables. > " > > It looks like you have just a binary of Sage that you did not compile yourself, is that right? I assume you do not have Xcode or the Command Line Tools? Also, what happens if you type
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