diff --git a/tdescreensaver/kdesavers/rkodesolver.cpp b/tdescreensaver/kdesavers/rkodesolver.cpp
index 2127a110..4c581416 100644
--- a/tdescreensaver/kdesavers/rkodesolver.cpp
+++ b/tdescreensaver/kdesavers/rkodesolver.cpp
@@ -10,6 +10,7 @@
 //
 //============================================================================
 
+#include <cstdlib>
 #include <kdebug.h>
 #include "rkodesolver.h"
 
diff --git a/tdescreensaver/kdesavers/rotation.cpp b/tdescreensaver/kdesavers/rotation.cpp
index 9d9a1442..a00f7bbc 100644
--- a/tdescreensaver/kdesavers/rotation.cpp
+++ b/tdescreensaver/kdesavers/rotation.cpp
@@ -123,9 +123,9 @@ std::valarray<double> EulerOdeSolver::f(
    ypr[2] = -(B-A)/C * omega_body[0] * omega_body[1]; // r'
 
    // e1', e2', e3'
-   ypr[std::slice(3,3,1)] = vec3<double>::crossprod(omega, e1);
-   ypr[std::slice(6,3,1)] = vec3<double>::crossprod(omega, e2);
-   ypr[std::slice(9,3,1)] = vec3<double>::crossprod(omega, e3);
+   ypr[std::slice(3,3,1)] = std::valarray<double>(vec3<double>::crossprod(omega, e1));
+   ypr[std::slice(6,3,1)] = std::valarray<double>(vec3<double>::crossprod(omega, e2));
+   ypr[std::slice(9,3,1)] = std::valarray<double>(vec3<double>::crossprod(omega, e3));
 
    return ypr;
 }
@@ -529,15 +529,17 @@ void KRotationSaver::initData()
    e3_body.rotate(-m_initEulerTheta*e1_body);
    // omega_body = L_body * J_body^(-1)
    vec3<double> omega_body = e3_body * m_Lz;
-   omega_body /= J;
+   std::valarray<double> &omega_body_ = omega_body;
+   std::valarray<double> &J_ = J;
+   omega_body_ /= J_;
 
    // assemble initial y for solver
    std::valarray<double> y(12);
-   y[std::slice(0,3,1)] = omega_body;
+   y[std::slice(0,3,1)] = std::valarray<double>(omega_body);
    // 3 basis vectors of body system in fixed coordinates
-   y[std::slice(3,3,1)] = e1t;
-   y[std::slice(6,3,1)] = e2t;
-   y[std::slice(9,3,1)] = e3t;
+   y[std::slice(3,3,1)] = std::valarray<double>(e1t);
+   y[std::slice(6,3,1)] = std::valarray<double>(e2t);
+   y[std::slice(9,3,1)] = std::valarray<double>(e3t);
 
    // initial rotation vector
    omega
diff --git a/tdescreensaver/kdesavers/vec3.cpp b/tdescreensaver/kdesavers/vec3.cpp
index c66730e5..1715937e 100644
--- a/tdescreensaver/kdesavers/vec3.cpp
+++ b/tdescreensaver/kdesavers/vec3.cpp
@@ -59,7 +59,9 @@ vec3<T>& vec3<T>::rotate(const vec3<T>& r)
       // part of vector which is parallel to r
       vec3<T> par(r*(*this)/(r*r) * r);
       // part of vector which is perpendicular to r
-      vec3<T> perp(*this - par);
+      vec3<T> perp(*this);
+      std::valarray<T> &perp_ = perp;
+      perp -= std::valarray<T>(par);
       // rotation direction, size of perp
       vec3<T> rotdir(norm(perp) * normalized(crossprod(r,perp)));
       *this = par + cos(phi)*perp + sin(phi)*rotdir;
diff --git a/tdescreensaver/kdesavers/vec3.h b/tdescreensaver/kdesavers/vec3.h
index 62aeb8ed..879c55f7 100644
--- a/tdescreensaver/kdesavers/vec3.h
+++ b/tdescreensaver/kdesavers/vec3.h
@@ -148,7 +148,9 @@ inline vec3<T>::vec3(const std::slice_array<T>& a)
 template<typename T>
 inline vec3<T> operator+(vec3<T> a, const vec3<T>& b)
 {
-   a += b;   /* valarray<T>::operator+=(const valarray<T>&) */
+   std::valarray<T> &a_ = a;
+   const std::valarray<T> &b_ = b;
+   a_ += b_;   /* valarray<T>::operator+=(const valarray<T>&) */
    return a;
 }
 
@@ -158,7 +160,9 @@ inline vec3<T> operator+(vec3<T> a, const vec3<T>& b)
 template<typename T>
 inline T operator*(vec3<T> a, const vec3<T>& b)
 {
-   a *= b;   /* valarray<T>::operator*=(const T&) */
+   std::valarray<T> &a_ = a;
+   const std::valarray<T> &b_ = b;
+   a_ *= b_;   /* valarray<T>::operator*=(const valarray<T>&) */
    return a.sum();
 }