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-rw-r--r--cmake/CMakeLists.txt3
1 files changed, 3 insertions, 0 deletions
diff --git a/cmake/CMakeLists.txt b/cmake/CMakeLists.txt
index 23c20aae..72c42318 100644
--- a/cmake/CMakeLists.txt
+++ b/cmake/CMakeLists.txt
@@ -102,6 +102,9 @@ option (DBUS_ENABLE_STATS "enable bus daemon usage statistics" OFF)
option (DBUS_ENABLE_STATS "enable bus daemon usage statistics" OFF)
+# analogous to AC_USE_SYSTEM_EXTENSIONS in configure.ac
+add_definitions(-D_POSIX_C_SOURCE=199309L -D_GNU_SOURCE)
+
# do config checks
INCLUDE(ConfigureChecks.cmake)