diff -rup a/ogr/ogrct.cpp b/ogr/ogrct.cpp
--- a/ogr/ogrct.cpp	2017-04-28 18:07:33.000000000 +0200
+++ b/ogr/ogrct.cpp	2017-05-19 21:06:54.145528449 +0200
@@ -102,7 +102,7 @@ static bool      bProjLocaleSafe = false
 #elif defined(__APPLE__)
 #  define LIBNAME "libproj.dylib"
 #else
-#  define LIBNAME "libproj.so"
+#  define LIBNAME "libproj.so.12"
 #endif
 
 /************************************************************************/