Fixed compilation errors

plugins/amoeba/platforms/reference/src/SimTKReference/AmoebaReferenceMultipoleForce.cpp

@@ -4407,6 +4407,10 @@ RealOpenMM AmoebaReferenceGeneralizedKirkwoodMultipoleForce::calculateKirkwoodED
     return energy;
 }
 
+const int AmoebaReferencePmeMultipoleForce::AMOEBA_PME_ORDER = 5;
+
+const RealOpenMM AmoebaReferencePmeMultipoleForce::SQRT_PI = 1.77245385091;
+
 AmoebaReferencePmeMultipoleForce::AmoebaReferencePmeMultipoleForce( void ) :
                AmoebaReferenceMultipoleForce(PME),
                _cutoffDistance(1.0), _cutoffDistanceSquared(1.0),

plugins/amoeba/platforms/reference/src/SimTKReference/AmoebaReferenceMultipoleForce.h

@@ -1285,8 +1285,8 @@ public:
 
 private:
 
-    static const int AMOEBA_PME_ORDER     = 5;
-    static const RealOpenMM SQRT_PI       = 1.77245385091;
+    static const int AMOEBA_PME_ORDER;
+    static const RealOpenMM SQRT_PI;
 
     RealOpenMM _alphaEwald;
     RealOpenMM _cutoffDistance;

plugins/rpmd/openmmapi/src/RPMDIntegrator.cpp

@@ -91,7 +91,7 @@ State RPMDIntegrator::getState(int copy, int types, bool enforcePeriodicBox, int
 }
 
 double RPMDIntegrator::computeKineticEnergy() {
-    kernel.getAs<IntegrateRPMDStepKernel>().computeKineticEnergy(*context, *this);
+    return kernel.getAs<IntegrateRPMDStepKernel>().computeKineticEnergy(*context, *this);
 }
 
 void RPMDIntegrator::step(int steps) {