Fix build with clang
Bug: https://bugs.gentoo.org/739386

--- a/carpettrack.h
+++ b/carpettrack.h
@@ -15,7 +15,7 @@ class CarpetTrack
       trackspace = dSimpleSpaceCreate(staticspace);
       track  = new StaticWorldObject(trackmodel, trackspace, initialpos);
       sgVec3 sz = { 2.0, 1.2, 0.08 };
-      sgVec3 cpos = { initialpos[0]+5, initialpos[1], initialpos[2]+0.6 };
+      sgVec3 cpos = { initialpos[0]+5, initialpos[1], initialpos[2]+0.6f };
       carpet = new DynamicBoxObject(carpetmodel, world, trackspace, cpos, sz);
       carpet->name = "carpet";
       carpet->SetMass(1.0);
--- a/doorstand.h
+++ b/doorstand.h
@@ -63,7 +63,7 @@ class DoorStand : public WorldObject
 
       // Do the door
       dReal sz[3] = { 0.1, 1.4, 1.6 };
-      dReal ps[3] = { initialpos[0], initialpos[1], initialpos[2]+0.85 };
+      dReal ps[3] = { initialpos[0], initialpos[1], initialpos[2]+0.85f };
       door_body = dBodyCreate(world);
       dBodySetAutoDisableFlag(door_body, false);
       dBodySetPosition(door_body, ps[0], ps[1], ps[2]);
--- a/spikejump.h
+++ b/spikejump.h
@@ -17,7 +17,7 @@ class SpikeJump
       spikespace = dSimpleSpaceCreate(staticspace);
       spikegate = new StaticWorldObject(spikemodel, spikespace, initialpos);
       sgVec3 sz = { 2.0, 1.2, 0.08 };
-      sgVec3 cpos = { initialpos[0], initialpos[1], initialpos[2]+0.6 };
+      sgVec3 cpos = { initialpos[0], initialpos[1], initialpos[2]+0.6f };
       jumpboard = new DynamicBoxObject(boardmodel, world, spikespace, cpos, sz);
       jumpboard->name = "jumpboard";
       jumpboard->SetMass(1.0);
--- a/ferriswheel.h
+++ b/ferriswheel.h
@@ -20,7 +20,7 @@ class FerrisWheelCart : public DynamicObject
       dBodySetPosition (body,initialpos[0],initialpos[1],initialpos[2]-1.45);
 
       dReal sizes[2][3] = {{ 2.0, 2.9, 0.1 },  {0.2, 0.3, 1.5}};
-      dReal xlats[2][4] = {{initialpos[0], initialpos[1], initialpos[2]-1.45}, {0,0,0.70}};
+      dReal xlats[2][4] = {{initialpos[0], initialpos[1], initialpos[2]-1.45f}, {0,0,0.70}};
 
       dMass m;
       dMassSetZero(&m);