diff --git a/CMakeLists.txt b/CMakeLists.txt
index 92c50b4..ca39cb1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,11 @@
 cmake_minimum_required(VERSION 2.8)
 
+# Grive version. remember to update it for every new release!
 set( GRIVE_VERSION "0.2.0" )
 
+# common compile options
+add_definitions( -DVERSION="${GRIVE_VERSION}" )
+add_definitions( -D_FILE_OFFSET_BITS=64 )
+
 add_subdirectory( libgrive )
 add_subdirectory( grive )
diff --git a/grive/CMakeLists.txt b/grive/CMakeLists.txt
index cde3578..d5f8ebe 100644
--- a/grive/CMakeLists.txt
+++ b/grive/CMakeLists.txt
@@ -7,8 +7,6 @@ include_directories(
 	${OPT_INCS}
 )
 
-add_definitions( -DVERSION="${GRIVE_VERSION}" )
-
 file (GLOB GRIVE_EXE_SRC
     ${grive_SOURCE_DIR}/src/*.cc
 )
diff --git a/libgrive/CMakeLists.txt b/libgrive/CMakeLists.txt
index 000d898..a19fc99 100644
--- a/libgrive/CMakeLists.txt
+++ b/libgrive/CMakeLists.txt
@@ -68,7 +68,6 @@ file (GLOB LIBGRIVE_SRC
 )
 
 add_definitions(
-	-DVERSION="${GRIVE_VERSION}"
 	-DTEST_DATA="${libgrive_SOURCE_DIR}/test/data/"
 	-DSRC_DIR="${libgrive_SOURCE_DIR}/src"
 )