Add explicit CMake check for compiler

CMakeLists.txt

@@ -1,4 +1,12 @@
-project(Bro)
+project(Bro C CXX)
+
+if (NOT CMAKE_C_COMPILER)
+    message(FATAL_ERROR "Could not find prerequisite C compiler")
+endif ()
+
+if (NOT CMAKE_CXX_COMPILER)
+    message(FATAL_ERROR "Could not find prerequisite C++ compiler")
+endif ()
 
 ########################################################################
 ## CMake Configuration

INSTALL

@@ -9,6 +9,8 @@ Prerequisites
 Bro relies on the following libraries and tools, which need to be installed
 before you begin:
 
+    * A C/C++ compiler
+
     * Libpcap headers and libraries
        Network traffic capture library
 
@@ -35,7 +37,7 @@ before you begin:
         though some platforms may require installation of a 'devel' package
          for the headers.
 
-    * CMake 2.8 or greater
+    * CMake 2.6 or greater
        CMake is a cross-platform, open-source build system, typically
        not installed by default.  See http://www.cmake.org for more
        information regarding CMake and the installation steps below for

aux/binpac

@@ -1 +1 @@
-Subproject commit 26d02716f9090651f319a4bfdf8ede49b3a7b53a
+Subproject commit 6f7b080181d2e1e363c7d0806a5c2a1e4704f7da

aux/bro-aux

@@ -1 +1 @@
-Subproject commit 7e50bac938af1831ecf9660159145a3c2e77e13d
+Subproject commit bf913bd8514f4bfbfc3c87eb80b968d3b3689da4

aux/broccoli

@@ -1 +1 @@
-Subproject commit 9332ab3467191ac22be09d6941ebd469e7a334d0
+Subproject commit dfb55c5f250660c846245f13c8dd87dd503e17a7

aux/broctl

@@ -1 +1 @@
-Subproject commit 06b74a0f23767c8345ed146657120aba812f6764
+Subproject commit 2e2b8197d9b105e10f07021004cd99c5aec5adaf