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-rw-r--r--libcrystfel/src/utils.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/libcrystfel/src/utils.h b/libcrystfel/src/utils.h
index 9607708f..d90ae461 100644
--- a/libcrystfel/src/utils.h
+++ b/libcrystfel/src/utils.h
@@ -80,6 +80,8 @@ extern gsl_vector *solve_svd(gsl_vector *v, gsl_matrix *M, int *n_filt,
extern size_t notrail(char *s);
extern void chomp(char *s);
+#define CLEAR_BIT(val, bit) (((val) | (bit)) ^ (bit))
+
/**
* Controls the behaviour of \ref assplode.
**/