1 files changed, 4 insertions, 0 deletions
diff --git a/src/proj.h b/src/proj.h
index 1d6191fd..3b4a1a67 100644
--- a/src/proj.h
+++ b/src/proj.h
@@ -304,6 +304,10 @@ struct PJ_FACTORS {
     int code;              /* info as to analytics, see following */
 };
 
+#define PJ_IS_ANAL_XL_YL 01    /* derivatives of lon analytic */
+#define PJ_IS_ANAL_XP_YP 02    /* derivatives of lat analytic */
+#define PJ_IS_ANAL_HK    04    /* h and k analytic */
+#define PJ_IS_ANAL_CONV 010    /* convergence analytic */
 
 struct PJ_INFO {
     char        release[64];        /* Release info. Version + date         */