Complement the README file with build instructions for the platforms it currently compiles on

Corresponding to flashrom svn r453.
Signed-off-by: Idwer Vollering <vidwer@gmail.com>
Acked-by: Peter Stuge <peter@stuge.se>

README

@@ -15,12 +15,21 @@ or SPI.
 Build Requirements
 ------------------
 
-To build the flashrom utility you need to install the following packages:
+To build the flashrom utility you need to install the following packages or
+ports:
 
+Linux et al:
 * pciutils
 * pciutils-devel / pciutils-dev / libpci-dev
 * zlib-devel / zlib1g-dev
 
+On FreeBSD, you need the following ports:
+* devel/gmake
+* devel/libpci
+
+To compile on FreeBSD, use the command below:
+gmake
+
 To compile on Solaris, use the commands below:
 gmake LDFLAGS="-L$pathtolibpci -lpci -lz" CC="gcc -I$pathtopciheaders" CFLAGS=-O2