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-rw-r--r--src/proj.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/proj.h b/src/proj.h
index 4da78351..0025f3ad 100644
--- a/src/proj.h
+++ b/src/proj.h
@@ -349,6 +349,7 @@ int proj_errno (const PJ *P);
int proj_errno_set (const PJ *P, int err);
int proj_errno_reset (const PJ *P);
int proj_errno_restore (const PJ *P, int err);
+const char* proj_errno_string (int err);
/* Scaling and angular distortion factors */
PJ_FACTORS proj_factors(PJ *P, PJ_COORD lp);