Add hint about configure and freebsd Ports location

ChangeLog

@@ -1,3 +1,8 @@
+2010-05-16 Chris Bagwell <chris at cnpbagwell dot com>
+	* README.freebsd: Add suggested hint that configure needs
+	to be told location of external libraries installed through
+	Ports.
+
 2010-05-16 Stéphane Voltz <stef.dev@free.fr>
 	* backend/genesys.[ch] backend/genesys_devices.c
 	backend/genesys.conf.in backend/genesys_gl847.[ch]

README.freebsd

@@ -6,6 +6,12 @@ Building:
 Don't forget to use GNU make (gmake). E.g. "MAKE=gmake ./configure". 
 SANE should compile and install out-of-the-box.
 
+If you've installed some of the optional libraries that sane-backends
+can make use of (see README for list) using Ports then you will need to 
+let configure know about their locations:
+
+MAKE=gmake CPPFLAGS=-I/usr/local/include LDFLAGS=-L/usr/local/lib ./configure
+
 SCSI-scanners:
 --------------
 If the SCSI host adapter is supported, there are no known problems.