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-rw-r--r--src/version.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/version.h b/src/version.h
index 0ecac74a..e31c4c17 100644
--- a/src/version.h
+++ b/src/version.h
@@ -1,2 +1,5 @@
+#ifndef CRYSTFEL_VERSION_H
+#define CRYSTFEL_VERSION_H
extern const char *crystfel_version_string(void);
extern const char *crystfel_licence_string(void);
+#endif