Be compatible with cmake 3.1

1 files changed, 1 insertions, 1 deletions

diff --git a/cmake/version.hpp b/cmake/version.hpp

index 272e84ac..204bc895 100644
--- a/cmake/version.hpp
+++ b/cmake/version.hpp
@@ -1,5 +1,5 @@
 namespace nheko {
 static constexpr const char *version    = "${PROJECT_VERSION}";
 static constexpr const char *build_user = "${BUILD_USER}@${BUILD_HOST}";
-static constexpr const char *build_os   = "${BUILD_OS}";
+static constexpr const char *build_os   = "${CMAKE_HOST_SYSTEM_NAME}";
 }