From 6f155f1878d187adba62b8555841e5c9a1901099 Mon Sep 17 00:00:00 2001
From: Dennis Luxen <info@project-osrm.org>
Date: Mon, 17 Nov 2014 10:20:45 +0100
Subject: [PATCH] add better check if protobuf is found

---
 CMakeLists.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2d72341792e..1b7ad2d0452 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -12,6 +12,10 @@ include(CheckCXXCompilerFlag)
 include(FindPackageHandleStandardArgs)
 
 find_package(Protobuf REQUIRED)
+if(PROTOBUF_PROTOC_EXECUTABLE STREQUAL "PROTOBUF_PROTOC_EXECUTABLE-NOTFOUND")
+  message(SEND_ERROR "protoc executable not found! Missing protobuf-compiler package?")
+endif()
+
 include_directories(${PROTOBUF_INCLUDE_DIRS})
 file(GLOB ProtoFiles "${CMAKE_CURRENT_SOURCE_DIR}/Descriptors/*.proto")
 PROTOBUF_GENERATE_CPP(ProtoSources ProtoHeaders ${ProtoFiles})