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My Grass gives me this error message, Grass_info_error(4816,1):'make' required. Please install 'make' first. This happens when I attempt to fetch an add-on (r.viewshed). What am I doing wrong? and what is 'make'? Thanks for helping for a Grass newbie. I'm running on Mac Snow Leopard if that makes any difference.

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Install the Xcode developer tools and see this SO question as well. – Luke Jan 18 at 7:06
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Thanks for the Xcode suggestion, but as I have Snow Leopard I can only install Xcode 3.2.2, since 4 is only available through purchase for Snow. I'm still having problems with my attempts to install viewshed. This is the error message at the end of the installation dialog: lipo: can't figure out the architecture type of: /var/folder s/58/58wPfZLCFWut1S7Od7Fu7++++TI/-Tmp-//ccj6TYRt.out make: *** [OBJ.i386-apple-darwin11.4.0/main.o] Error 1 ERROR: Compilation failed, sorry. Please check above error messages. – user14353 Jan 19 at 5:53

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You may install GRASS 7 in parallel, it contains r.viewshed (so, no need to install it as addon): http://grass.osgeo.org/download/software/mac-osx/

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