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-rw-r--r--cmake/CMakeLists.txt2
1 files changed, 1 insertions, 1 deletions
diff --git a/cmake/CMakeLists.txt b/cmake/CMakeLists.txt
index f25e55d9..aecc74cd 100644
--- a/cmake/CMakeLists.txt
+++ b/cmake/CMakeLists.txt
@@ -103,7 +103,7 @@ find_package(EXPAT)
find_package(X11)
# analogous to AC_USE_SYSTEM_EXTENSIONS in configure.ac
-add_definitions(-D_POSIX_C_SOURCE=199309L -D_GNU_SOURCE)
+add_definitions(-D_GNU_SOURCE)
# do config checks
INCLUDE(ConfigureChecks.cmake)