diff --git a/CHANGES b/CHANGES
index a8a965618d..b05242c31f 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,5 +1,9 @@
 
-2.4-45 | 2015-07-21 10:50:02 -0700
+2.4-45 | 2015-07-21 15:19:43 -0700
+
+  * Enabling Broker by default. This means CAF is now a required
+    dependency, altjough for now at least, there's still a switch
+    --disable-broker to turn it off.
 
   * Requiring a C++11 compiler, and turning on C++11 support. (Robin
     Sommer)
diff --git a/NEWS b/NEWS
index e47b58ffd0..348c179bdc 100644
--- a/NEWS
+++ b/NEWS
@@ -4,6 +4,18 @@ release. For an exhaustive list of changes, see the ``CHANGES`` file
 (note that submodules, such as BroControl and Broccoli, come with
 their own ``CHANGES``.)
 
+Bro 2.5 (in progress)
+=====================
+
+New Dependencies
+----------------
+
+- Bro now requires a compiler with C++11 support for building the
+  source code.
+
+- Bro now requires the C++ Actor Framework, CAF, which must be
+  installed first. See http://actor-framework.org.
+
 Bro 2.4
 =======
 
diff --git a/configure b/configure
index 950905b2c1..407a2e2dca 100755
--- a/configure
+++ b/configure
@@ -41,8 +41,7 @@ Usage: $0 [OPTION]... [VAR=VALUE]...
     --enable-perftools-debug use Google's perftools for debugging
     --enable-jemalloc      link against jemalloc
     --enable-ruby          build ruby bindings for broccoli (deprecated)
-    --enable-broker        enable use of the Broker communication library
-                           (requires C++ Actor Framework and C++11)
+    --disable-broker       disable use of the Broker communication library
     --disable-broccoli     don't build or install the Broccoli library
     --disable-broctl       don't install Broctl
     --disable-auxtools     don't build or install auxiliary tools
@@ -94,7 +93,7 @@ Usage: $0 [OPTION]... [VAR=VALUE]...
 sourcedir="$( cd "$( dirname "$0" )" && pwd )"
 
 # Function to append a CMake cache entry definition to the
-# CMakeCacheEntries variable
+# CMakeCacheEntries variable.
 #   $1 is the cache entry variable name
 #   $2 is the cache entry variable type
 #   $3 is the cache entry variable value
@@ -102,6 +101,17 @@ append_cache_entry () {
     CMakeCacheEntries="$CMakeCacheEntries -D $1:$2=$3"
 }
 
+# Function to remove a CMake cache entry definition from the
+# CMakeCacheEntries variable
+#   $1 is the cache entry variable name
+remove_cache_entry () {
+    CMakeCacheEntries="$CMakeCacheEntries -U $1"
+
+    # Even with -U, cmake still warns by default if
+    # added previously with -D.
+    CMakeCacheEntries="$CMakeCacheEntries --no-warn-unused-cli"
+}
+
 # set defaults
 builddir=build
 prefix=/usr/local/bro
@@ -111,10 +121,12 @@ append_cache_entry BRO_ROOT_DIR         PATH   $prefix
 append_cache_entry PY_MOD_INSTALL_DIR   PATH   $prefix/lib/broctl
 append_cache_entry BRO_SCRIPT_INSTALL_PATH STRING $prefix/share/bro
 append_cache_entry BRO_ETC_INSTALL_DIR  PATH   $prefix/etc
+append_cache_entry BROKER_PYTHON_HOME   PATH   $prefix
 append_cache_entry ENABLE_DEBUG         BOOL   false
 append_cache_entry ENABLE_PERFTOOLS     BOOL   false
 append_cache_entry ENABLE_PERFTOOLS_DEBUG BOOL false
-append_cache_entry ENABLE_JEMALLOC      BOOL false
+append_cache_entry ENABLE_JEMALLOC      BOOL   false
+append_cache_entry ENABLE_BROKER        BOOL   true
 append_cache_entry BinPAC_SKIP_INSTALL  BOOL   true
 append_cache_entry BUILD_SHARED_LIBS    BOOL   true
 append_cache_entry INSTALL_AUX_TOOLS    BOOL   true
@@ -149,8 +161,8 @@ while [ $# -ne 0 ]; do
             append_cache_entry BRO_ROOT_DIR         PATH   $optarg
             append_cache_entry PY_MOD_INSTALL_DIR   PATH   $optarg/lib/broctl
 
-            if [ -n "$user_enabled_broker" ]; then
-                append_cache_entry BROKER_PYTHON_HOME   PATH   $prefix
+            if [ -n "$user_disabled_broker" ]; then
+                append_cache_entry BROKER_PYTHON_HOME   PATH   $optarg
             fi
             ;;
         --scriptdir=*)
@@ -186,10 +198,10 @@ while [ $# -ne 0 ]; do
         --enable-jemalloc)
             append_cache_entry ENABLE_JEMALLOC     BOOL   true
             ;;
-        --enable-broker)
-            append_cache_entry ENABLE_BROKER        BOOL   true
-            append_cache_entry BROKER_PYTHON_HOME   PATH   $prefix
-            user_enabled_broker="true"
+        --disable-broker)
+            append_cache_entry ENABLE_BROKER        BOOL   false
+            remove_cache_entry BROKER_PYTHON_HOME
+            user_disabled_broker="true"
             ;;
         --disable-broccoli)
             append_cache_entry INSTALL_BROCCOLI     BOOL   false
diff --git a/doc/install/install.rst b/doc/install/install.rst
index 03b77fba8c..eff3ec9728 100644
--- a/doc/install/install.rst
+++ b/doc/install/install.rst
@@ -32,12 +32,13 @@ before you begin:
     * Libz
     * Bash (for BroControl)
     * Python (for BroControl)
+    * C++ Actor Framework (CAF)         (http://actor-framework.org)
 
 To build Bro from source, the following additional dependencies are required:
 
     * CMake 2.8 or greater              (http://www.cmake.org)
     * Make
-    * C/C++ compiler
+    * C/C++ compiler with C++11 support
     * SWIG                              (http://www.swig.org)
     * Bison (GNU Parser Generator)
     * Flex  (Fast Lexical Analyzer)
@@ -46,6 +47,10 @@ To build Bro from source, the following additional dependencies are required:
     * zlib headers
     * Perl
 
+.. todo::
+
+    Update with instructions for installing CAF.
+
 To install the required dependencies, you can use:
 
 * RPM/RedHat-based Linux: