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--- src/gshhs.cpp.orig	2018-03-28 19:12:21 UTC
+++ src/gshhs.cpp
@@ -235,7 +235,7 @@ else
         double ss = h.south * GSHHS_SCL;
         double nn = h.north * GSHHS_SCL;
         char source = (src == 1) ? 'W' : 'C'; // Either WVS or CIA (WDBII) pedigree 
-        if ( river ) source = tolower( (int) source ); // Lower case c means river-lake 
+        if ( river ) source = std::tolower( (int) source ); // Lower case c means river-lake 
         int line = (h.area) ? 0 : 1; // Either Polygon (0) or Line (1) (if no area)