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-rw-r--r--libcrystfel/src/taketwo.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/libcrystfel/src/taketwo.c b/libcrystfel/src/taketwo.c
index 5b5bff59..65265b0e 100644
--- a/libcrystfel/src/taketwo.c
+++ b/libcrystfel/src/taketwo.c
@@ -86,6 +86,10 @@
* * Clean up the mess (cleanup_taketwo_obs_vecs())
*/
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
#include <gsl/gsl_matrix.h>
#include <gsl/gsl_blas.h>
#include <float.h>