Fix FTBFS with clang

[taken from NetBSD kdeartwork3 patches]
(cherry picked from commit 23c3263f1b2b48b729f3877e93abcd9788d7893f)

1 files changed, 3 insertions, 1 deletions

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;