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-rw-r--r--lib/pam.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/pam.h b/lib/pam.h
index c28c5c2c..3d1f8532 100644
--- a/lib/pam.h
+++ b/lib/pam.h
@@ -483,6 +483,10 @@ pnm_YCbCr_to_rgbtuple(const struct pam * const pamP,
     ((tuple)[PAM_RED_PLANE] == (tuple)[PAM_GRN_PLANE] && \
      (tuple)[PAM_RED_PLANE] == (tuple)[PAM_BLU_PLANE])
 
+tuple
+pnm_backgroundtuple(struct pam *  const pamP,
+                    tuple      ** const tuples);
+
 /*----------------------------------------------------------------------------
    These are meant for passing to pm_system() as Standard Input feeder
    and Standard Output accepter.