Agreed. What's the idiom to check if a formula is installed, and allow for overriding if a user passes in that option via `homebrew install --important-thing`?

On Wed, Aug 21, 2013 at 9:14 PM, Adam Vandenberg <notifications@github.com>
wrote:

>>      system "./autogen.sh"
>> -    system "./configure", "--with-proj=#{proj.opt_prefix}"
>> +    system "./configure", "--with-proj=#{proj.opt_prefix}", "--with-protobuf-c=#{protobufc.opt_prefix}"
> This needs to be conditional.
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