diff --git a/include/boost/geometry/srs/projections/proj/aeqd.hpp b/include/boost/geometry/srs/projections/proj/aeqd.hpp
index de0b0b71c..b825759df 100644
--- a/include/boost/geometry/srs/projections/proj/aeqd.hpp
+++ b/include/boost/geometry/srs/projections/proj/aeqd.hpp
@@ -145,8 +145,6 @@ namespace projections
             template <typename T, typename Par, typename ProjParm>
             inline void e_inverse(T& xy_x, T& xy_y, T& lp_lon, T& lp_lat, Par const& par, ProjParm const& proj_parm)
             {
-                static const T HALFPI = detail::HALFPI<T>();
-
                 T c;
 
                 if ((c = boost::math::hypot(xy_x, xy_y)) < EPS10) {
diff --git a/include/boost/geometry/srs/projections/proj/etmerc.hpp b/include/boost/geometry/srs/projections/proj/etmerc.hpp
index adceaded4..d63391012 100644
--- a/include/boost/geometry/srs/projections/proj/etmerc.hpp
+++ b/include/boost/geometry/srs/projections/proj/etmerc.hpp
@@ -60,6 +60,7 @@
 #include <boost/geometry/srs/projections/impl/base_dynamic.hpp>
 #include <boost/geometry/srs/projections/impl/projects.hpp>
 #include <boost/geometry/srs/projections/impl/factory_entry.hpp>
+#include <boost/geometry/srs/projections/impl/function_overloads.hpp>
 
 namespace boost { namespace geometry
 {
diff --git a/include/boost/geometry/srs/projections/proj/healpix.hpp b/include/boost/geometry/srs/projections/proj/healpix.hpp
index e4d106833..c1f429fe5 100644
--- a/include/boost/geometry/srs/projections/proj/healpix.hpp
+++ b/include/boost/geometry/srs/projections/proj/healpix.hpp
@@ -488,7 +488,6 @@ namespace projections
             inline void combine_caps(T& xy_x, T& xy_y, int north_square, int south_square,
                                      int inverse)
             {
-                static const T ONEPI = detail::ONEPI<T>();
                 static const T HALFPI = detail::HALFPI<T>();
                 static const T FORTPI = detail::FORTPI<T>();