diff --git a/depends/protobuf/CMakeLists.txt b/depends/protobuf/CMakeLists.txt
index 92504f059..dddefb06b 100644
--- a/depends/protobuf/CMakeLists.txt
+++ b/depends/protobuf/CMakeLists.txt
@@ -57,7 +57,7 @@ IF(CMAKE_COMPILER_IS_GNUCC)
     ENDIF()
 
     IF (HAVE_HASH_MAP EQUAL 0)
-        MESSAGE(SEND_ERROR "Could not find a working hash map implementation. Please update GCC.")
+        MESSAGE(SEND_ERROR "Could not find a working hash map implementation. Please install GCC >= 4.4, and all necessary 32-bit C++ development libraries.")
     ENDIF()
 
     FIND_PACKAGE(Threads)