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-rw-r--r--libcrystfel/src/asdf.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/libcrystfel/src/asdf.c b/libcrystfel/src/asdf.c
index 132db47d..248da92c 100644
--- a/libcrystfel/src/asdf.c
+++ b/libcrystfel/src/asdf.c
@@ -28,6 +28,12 @@
*
*/
+#define _ISOC99_SOURCE
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
#include <stdlib.h>
#include <stdio.h>
#include <math.h>