From: Augusto Esteves <augustoeae@...>
Date: 2009-12-29T11:00:30+09:00
Subject: Re: Installing Gems on Windows

Phillip Gawlowski wrote:

> The MinGW compiler used by ruby needs to know where the *header* files
> are to get them.
> 
> My guess is that you need the source for libnfc, and add their path to
> your your %path% environment variable (if only temporarily), by doing
> something like "set path = %path%;C:\Path\To\Header\Files", and then
> "gem install".
> 
> Mind, this doesn't guarantee, at all, that your gem will work. Or even
> that the libnfc you have works (the lib has to be compiled for windows,
> with a compiler compatible to MinGW32's gcc3.4 to be usable by Ruby),
> *and* the header files have to be usable for Windows, too.
> 
> Linux and Windows platforms are *not* compatible to each other, so
> unless you know your way around C, and can fix the errors gcc/gem hands
> you, you'll either have to fix the errors yourself, or lobby the
> libnfc/nfc-gem maintainers to fix the issue (if, indeed, this is an
> issue for them in the first place).

I do have the binaries for Windows, the problem is where to put them in 
order for the RubyGem installer to detect them. By running c:\gem 
install nfc I get, amongst other things:

checking for libnfc/libnfc.h in 
/opt/local/include,/opt/local/include,/usr/local
/include,C:/Ruby19/include,/usr/include... no

libnfc is missing.  please install libnfc: http://libnfc.org/

I can trick this process by creating a folder libnfc inside 
C:/Ruby19/include, and then put the libnfc.h there (as the rest of the 
files). Doing that I get:

checking for libnfc/libnfc.h in 
/opt/local/include,/opt/local/include,/usr/local
/include,C:/Ruby19/include,/usr/include... yes

checking for nfc_connect() in -lnfc... no

libnfc is missing.  please install libnfc: http://libnfc.org/

So basically I need to figure out where everything goes, regarding the 
libnfc binary files.


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