Tweak the error message as the generate is in the core binary these days.

objectivec/google/protobuf/Any.pbobjc.h

@@ -4,7 +4,7 @@
 #import "GPBProtocolBuffers.h"
 
 #if GOOGLE_PROTOBUF_OBJC_GEN_VERSION != 30000
-#error This file was generated by a different version of protoc-gen-objc which is incompatible with your Protocol Buffer sources.
+#error This file was generated by a different version of protoc which is incompatible with your Protocol Buffer library sources.
 #endif
 
 // @@protoc_insertion_point(imports)

objectivec/google/protobuf/Api.pbobjc.h

@@ -4,7 +4,7 @@
 #import "GPBProtocolBuffers.h"
 
 #if GOOGLE_PROTOBUF_OBJC_GEN_VERSION != 30000
-#error This file was generated by a different version of protoc-gen-objc which is incompatible with your Protocol Buffer sources.
+#error This file was generated by a different version of protoc which is incompatible with your Protocol Buffer library sources.
 #endif
 
 // @@protoc_insertion_point(imports)

objectivec/google/protobuf/Descriptor.pbobjc.h

@@ -4,7 +4,7 @@
 #import "GPBProtocolBuffers.h"
 
 #if GOOGLE_PROTOBUF_OBJC_GEN_VERSION != 30000
-#error This file was generated by a different version of protoc-gen-objc which is incompatible with your Protocol Buffer sources.
+#error This file was generated by a different version of protoc which is incompatible with your Protocol Buffer library sources.
 #endif
 
 // @@protoc_insertion_point(imports)

objectivec/google/protobuf/Duration.pbobjc.h

@@ -4,7 +4,7 @@
 #import "GPBProtocolBuffers.h"
 
 #if GOOGLE_PROTOBUF_OBJC_GEN_VERSION != 30000
-#error This file was generated by a different version of protoc-gen-objc which is incompatible with your Protocol Buffer sources.
+#error This file was generated by a different version of protoc which is incompatible with your Protocol Buffer library sources.
 #endif
 
 // @@protoc_insertion_point(imports)

objectivec/google/protobuf/Empty.pbobjc.h

@@ -4,7 +4,7 @@
 #import "GPBProtocolBuffers.h"
 
 #if GOOGLE_PROTOBUF_OBJC_GEN_VERSION != 30000
-#error This file was generated by a different version of protoc-gen-objc which is incompatible with your Protocol Buffer sources.
+#error This file was generated by a different version of protoc which is incompatible with your Protocol Buffer library sources.
 #endif
 
 // @@protoc_insertion_point(imports)

objectivec/google/protobuf/FieldMask.pbobjc.h

@@ -4,7 +4,7 @@
 #import "GPBProtocolBuffers.h"
 
 #if GOOGLE_PROTOBUF_OBJC_GEN_VERSION != 30000
-#error This file was generated by a different version of protoc-gen-objc which is incompatible with your Protocol Buffer sources.
+#error This file was generated by a different version of protoc which is incompatible with your Protocol Buffer library sources.
 #endif
 
 // @@protoc_insertion_point(imports)

objectivec/google/protobuf/SourceContext.pbobjc.h

@@ -4,7 +4,7 @@
 #import "GPBProtocolBuffers.h"
 
 #if GOOGLE_PROTOBUF_OBJC_GEN_VERSION != 30000
-#error This file was generated by a different version of protoc-gen-objc which is incompatible with your Protocol Buffer sources.
+#error This file was generated by a different version of protoc which is incompatible with your Protocol Buffer library sources.
 #endif
 
 // @@protoc_insertion_point(imports)

objectivec/google/protobuf/Struct.pbobjc.h

@@ -4,7 +4,7 @@
 #import "GPBProtocolBuffers.h"
 
 #if GOOGLE_PROTOBUF_OBJC_GEN_VERSION != 30000
-#error This file was generated by a different version of protoc-gen-objc which is incompatible with your Protocol Buffer sources.
+#error This file was generated by a different version of protoc which is incompatible with your Protocol Buffer library sources.
 #endif
 
 // @@protoc_insertion_point(imports)

objectivec/google/protobuf/Timestamp.pbobjc.h

@@ -4,7 +4,7 @@
 #import "GPBProtocolBuffers.h"
 
 #if GOOGLE_PROTOBUF_OBJC_GEN_VERSION != 30000
-#error This file was generated by a different version of protoc-gen-objc which is incompatible with your Protocol Buffer sources.
+#error This file was generated by a different version of protoc which is incompatible with your Protocol Buffer library sources.
 #endif
 
 // @@protoc_insertion_point(imports)

objectivec/google/protobuf/Type.pbobjc.h

@@ -4,7 +4,7 @@
 #import "GPBProtocolBuffers.h"
 
 #if GOOGLE_PROTOBUF_OBJC_GEN_VERSION != 30000
-#error This file was generated by a different version of protoc-gen-objc which is incompatible with your Protocol Buffer sources.
+#error This file was generated by a different version of protoc which is incompatible with your Protocol Buffer library sources.
 #endif
 
 // @@protoc_insertion_point(imports)

objectivec/google/protobuf/Wrappers.pbobjc.h

@@ -4,7 +4,7 @@
 #import "GPBProtocolBuffers.h"
 
 #if GOOGLE_PROTOBUF_OBJC_GEN_VERSION != 30000
-#error This file was generated by a different version of protoc-gen-objc which is incompatible with your Protocol Buffer sources.
+#error This file was generated by a different version of protoc which is incompatible with your Protocol Buffer library sources.
 #endif
 
 // @@protoc_insertion_point(imports)

src/google/protobuf/compiler/objectivec/objectivec_file.cc

@@ -95,7 +95,7 @@ void FileGenerator::GenerateHeader(io::Printer *printer) {
   // code is being compiled with.
   printer->Print(
       "#if GOOGLE_PROTOBUF_OBJC_GEN_VERSION != $protoc_gen_objc_version$\n"
-      "#error This file was generated by a different version of protoc-gen-objc which is incompatible with your Protocol Buffer sources.\n"
+      "#error This file was generated by a different version of protoc which is incompatible with your Protocol Buffer library sources.\n"
       "#endif\n"
       "\n",
       "protoc_gen_objc_version",