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-rw-r--r--config.h.cmake1
1 files changed, 1 insertions, 0 deletions
diff --git a/config.h.cmake b/config.h.cmake
index 452525da24e..7abd23cb4b8 100644
--- a/config.h.cmake
+++ b/config.h.cmake
@@ -18,6 +18,7 @@
#cmakedefine DOT_FRM_VERSION @DOT_FRM_VERSION@
/* Headers we may want to use. */
#cmakedefine STDC_HEADERS 1
+#cmakedefine _GNU_SOURCE 1
#cmakedefine HAVE_ALLOCA_H 1
#cmakedefine HAVE_AIO_H 1
#cmakedefine HAVE_ARPA_INET_H 1