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-rw-r--r--libcrystfel/src/thread-pool.c1
1 files changed, 0 insertions, 1 deletions
diff --git a/libcrystfel/src/thread-pool.c b/libcrystfel/src/thread-pool.c
index 7ce55d85..8cec8e2e 100644
--- a/libcrystfel/src/thread-pool.c
+++ b/libcrystfel/src/thread-pool.c
@@ -31,7 +31,6 @@
#endif
#ifdef HAVE_CPU_AFFINITY
-#define _GNU_SOURCE
#include <sched.h>
#endif