diff --git a/.gitignore b/.gitignore
index 3bc5a6ffda..7bd42557b7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -12,6 +12,7 @@ Factor/factor
 *.res
 *.RES
 *.image
+factor.image.fresh
 *.dylib
 factor
 factor.com
diff --git a/basis/classes/struct/struct-docs.factor b/basis/classes/struct/struct-docs.factor
index 7dbfda1f4f..68a4876f92 100644
--- a/basis/classes/struct/struct-docs.factor
+++ b/basis/classes/struct/struct-docs.factor
@@ -35,7 +35,8 @@ HELP: STRUCT:
 { "Struct classes cannot have a superclass defined." }
 { "The slots of a struct must all have a type declared. The type must be a C type." } 
 { { $link read-only } " slots on structs are not enforced, though they may be declared." }
-} } ;
+}
+"Additionally, structs may use bit fields. A slot specifier may use the syntax " { $snippet "bits: n" } " to specify that the bit width of the slot is " { $snippet "n" } ". Bit width may be specified on signed or unsigned integer slots. The layout of bit fields is not guaranteed to match that of any particular C compiler." } ;
 
 HELP: S{
 { $syntax "S{ class slots... }" }
diff --git a/basis/io/sockets/sockets-docs.factor b/basis/io/sockets/sockets-docs.factor
index 8cc6ef731d..a41fc1e6c3 100644
--- a/basis/io/sockets/sockets-docs.factor
+++ b/basis/io/sockets/sockets-docs.factor
@@ -192,12 +192,13 @@ HELP: <datagram>
     }
 }
 { $notes
-    "To accept UDP/IP packets from any host, use an address specifier returned by the following code, where 1234 is the desired port number:"
-    { $code "f 1234 <inet> resolve-host" }
-    "To accept UDP/IP packets from the loopback interface only, use an address specifier returned by the following code, where 1234 is the desired port number:"
-    { $code "\"localhost\" 1234 <inet> resolve-host" }
+    "To accept UDP/IP packets from any host, use an address specifier where the host name is set to " { $link f } ":"
+    { $code "f 1234 <inet4> <datagram>" }
+    "To create a datagram socket bound to a randomly-assigned port, set the port number in the address specifier to 0, and then read the " { $snippet "addr" } " slot of the datagram instance to obtain the actual port number it is bound to:"
+    { $code "f 0 <inet4> <datagram>" }
+    "To accept UDP/IP packets from the loopback interface only, use an address specifier like the following:"
+    { $code "\"127.0.0.1\" 1234 <inet4> <datagram>s" }
     "Since " { $link resolve-host } " can return multiple address specifiers, your code must create a datagram socket for each one and co-ordinate packet sending accordingly."
-    "Datagrams are low-level binary ports that don't map onto streams, so the constructor does not use an encoding"
 }
 { $errors "Throws an error if the port is already in use, or if the OS forbids access." } ;
 
diff --git a/build-support/factor.sh b/build-support/factor.sh
index bcc3e8f966..d8b547d8d6 100755
--- a/build-support/factor.sh
+++ b/build-support/factor.sh
@@ -25,7 +25,8 @@ test_program_installed() {
 
 exit_script() {
     if [[ $FIND_MAKE_TARGET -eq true ]] ; then
-        $ECHO $MAKE_TARGET;
+		# Must be echo not $ECHO
+        echo $MAKE_TARGET;
     fi
     exit $1
 }
diff --git a/extra/build-support/authors.txt b/extra/build-support/authors.txt
new file mode 100644
index 0000000000..7c1b2f2279
--- /dev/null
+++ b/extra/build-support/authors.txt
@@ -0,0 +1 @@
+Doug Coleman
diff --git a/extra/build-support/build-support-tests.factor b/extra/build-support/build-support-tests.factor
new file mode 100644
index 0000000000..1f855d5701
--- /dev/null
+++ b/extra/build-support/build-support-tests.factor
@@ -0,0 +1,6 @@
+! Copyright (C) 2010 Doug Coleman.
+! See http://factorcode.org/license.txt for BSD license.
+USING: build-support sequences tools.test ;
+IN: build-support.tests
+
+[ f ] [ factor.sh-make-target empty? ] unit-test
diff --git a/extra/build-support/build-support.factor b/extra/build-support/build-support.factor
new file mode 100644
index 0000000000..177042e186
--- /dev/null
+++ b/extra/build-support/build-support.factor
@@ -0,0 +1,10 @@
+! Copyright (C) 2010 Doug Coleman.
+! See http://factorcode.org/license.txt for BSD license.
+USING: arrays io io.backend io.encodings.utf8 io.launcher ;
+IN: build-support
+
+CONSTANT: factor.sh-path "resource:build-support/factor.sh"
+
+: factor.sh-make-target ( -- string )
+    factor.sh-path normalize-path "make-target" 2array
+    utf8 [ readln ] with-process-reader ;
diff --git a/extra/build-support/platforms.txt b/extra/build-support/platforms.txt
new file mode 100644
index 0000000000..509143d863
--- /dev/null
+++ b/extra/build-support/platforms.txt
@@ -0,0 +1 @@
+unix