From 5682d1688d1646e99af3ca9af9f7f89c18ea143a Mon Sep 17 00:00:00 2001
From: Sarah Hoffmann <lonvia@denofr.de>
Date: Fri, 17 Mar 2017 23:05:06 +0100
Subject: [PATCH] cmake: add a more explicit hint when osm2pgsql is missing

Fixes #642.
---
 CMakeLists.txt | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 28600018..79cc7d19 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -34,6 +34,12 @@ add_definitions(-DNOMINATIM_VERSION="${NOMINATIM_VERSION}")
 
 set(BUILD_TESTS off CACHE BOOL "Build test suite" FORCE)
 set(WITH_LUA off CACHE BOOL "Build with lua support" FORCE)
+
+if (NOT EXISTS "${CMAKE_SOURCE_DIR}/osm2pgsql/CMakeLists.txt")
+    message(FATAL_ERROR "The osm2pgsql directory is empty.\
+    Did you forget to check out Nominatim recursively?\
+    \nTry updating submodules with: git submodules update --init")
+endif()
 add_subdirectory(osm2pgsql)
 
 find_package(Threads REQUIRED)
-- 
2.45.1