Merge pull request #21 from PedroLopes/master

OSX Install notes after workshop 

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+# OSX Install
+The toolchain should be easy to install on OSX platforms. Below are a few troubleshooting items found on Mountain Lion (10.8.2). 
+
+## installing ftdi library
+- libftdi (allows you to have .so lib binary and the ftdi.h header)
+libftdi has been renamed to libftdi0, so either do:
+
+`port install libftdi0` (note that ports installs the tool to /opt instead of /usr, see next note)
+
+`brew install libftdi0`
+
+## iceprog make error on "ftdi.h not found"
+Note that Mac Ports installs to /opt instead of /usr, so change the makefile's first two lines to:
+
+`  LDLIBS = -L/usr/local/lib -L/opt/local/lib -lftdi -lm`
+
+`  CFLAGS = -MD -O0 -ggdb -Wall -std=c99 -I/usr/local/include -I/opt/local/include/`
+
+Basically you are indicating where to find the lib with -L/opt/local/lib and where to find the .h with -I/opt/local/include/
+
+## yosis make error on "<tuple> not found"
+This is a compiler issue, i.e., you are probably running on clang and you can circumvent this error by compiling against another compiler.
+Edit the Makefile of yosis and replace the two first lines for this, i.e., comment the first line (clang) and uncomment the second (gcc):
+
+`#CONFIG := clang`
+
+` CONFIG := gcc`
+
+##  error "Can't find iCE FTDI USB device (vedor_id 0x0403, device_id 0x6010)." while uploading code to FPGA (e.g., `iceprog example.bin`)
+You need to unload the FTDI driver. (notes below are from Mountain Lion, 10.8.2).
+First check if it is running: `kextstat | grep FTDIUSBSerialDriver`
+
+If you see if on the kextstat, we need to unload it: `sudo kextunload -b com.FTDI.driver.FTDIUSBSerialDriver`
+
+Repeat the kextstat command and check that the driver was successfully unloaded. 
+
+Repeat your `iceprog example.bin`
+
+Note: On newer OSes perhaps you need to also kextunload the `com.apple.driver.AppleUSBFTDI`