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diff --git a/libcrystfel/src/profile.h b/libcrystfel/src/profile.h
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+/*
+ * profile.h
+ *
+ * Simple profiling according to wall clock time
+ *
+ * Copyright © 2016-2022 Deutsches Elektronen-Synchrotron DESY,
+ *                       a research centre of the Helmholtz Association.
+ *
+ * Authors:
+ *   2016-2022 Thomas White <taw@physics.org>
+ *
+ * This file is part of CrystFEL.
+ *
+ * CrystFEL is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * CrystFEL is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with CrystFEL.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef PROFILE_H
+#define PROFILE_H
+
+/**
+ * \file profile.h
+ * Simple wall-clock profiling
+ */
+
+extern void profile_init();
+extern void profile_print_and_reset();
+extern void profile_start(const char *name);
+extern void profile_end(const char *name);
+
+#endif	/* PROFILE_H */