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-rw-r--r--src/PJ_mbtfpq.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/PJ_mbtfpq.c b/src/PJ_mbtfpq.c
index 3298db4f..0d343fad 100644
--- a/src/PJ_mbtfpq.c
+++ b/src/PJ_mbtfpq.c
@@ -13,6 +13,7 @@ PROJ_HEAD(mbtfpq, "McBryde-Thomas Flat-Polar Quartic") "\n\tCyl., Sph.";
FORWARD(s_forward); /* spheroid */
double th1, c;
int i;
+ (void) P;
c = C * sin(lp.phi);
for (i = NITER; i; --i) {