cmake: use add_definitions for compatibility with cmake 3.0
diff --git a/CMakeLists.txt b/CMakeLists.txt
index d9e2557..76c457c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -59,7 +59,7 @@ include(${SDL2_SOURCE_DIR}/cmake/sdlchecks.cmake)
# with large inode numbers
check_symbol_exists("__GLIBC__" "stdlib.h" LIBC_IS_GLIBC)
if (LIBC_IS_GLIBC AND CMAKE_SIZEOF_VOID_P EQUAL 4)
- add_compile_definitions(PRIVATE _FILE_OFFSET_BITS=64)
+ add_definitions(-D_FILE_OFFSET_BITS=64)
endif()
# See docs/release_checklist.md