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-rw-r--r--CMakeLists.txt2
1 files changed, 1 insertions, 1 deletions
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 44b437c1..da0ccf88 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -197,7 +197,7 @@ if(GLIB2_FOUND)
endif()
# analogous to AC_USE_SYSTEM_EXTENSIONS in configure.ac
-add_definitions(-D_GNU_SOURCE)
+set(_GNU_SOURCE 1)
# do config checks
include(ConfigureChecks)