diff --git a/Lib/Math/point3d.hxx b/Lib/Math/point3d.hxx
index d677de8de..5e419a803 100644
--- a/Lib/Math/point3d.hxx
+++ b/Lib/Math/point3d.hxx
@@ -295,9 +295,9 @@ inline Point3D operator / (const Point3D& a, const double d)
 inline bool operator == (const Point3D& a, const Point3D& b)
 {
     return
-	(a.n[PX] - b.n[PX]) < fgPoint3_Epsilon &&
-	(a.n[PY] - b.n[PY]) < fgPoint3_Epsilon &&
-	(a.n[PZ] - b.n[PZ]) < fgPoint3_Epsilon;
+	fabs(a.n[PX] - b.n[PX]) < fgPoint3_Epsilon &&
+	fabs(a.n[PY] - b.n[PY]) < fgPoint3_Epsilon &&
+	fabs(a.n[PZ] - b.n[PZ]) < fgPoint3_Epsilon;
 }
 
 inline bool operator != (const Point3D& a, const Point3D& b)
diff --git a/README.plib b/README.plib
index ab2216274..0bbf51cb9 100644
--- a/README.plib
+++ b/README.plib
@@ -16,5 +16,6 @@ If you would prefer to install these in /usr/local/include/plib/ and
 
     ./configure --prefix=/usr/local --includedir=/usr/local/include/plib
 
-Installing like this makes it much easier for the fgfs configure script
-to locate the plib includes and libs.
+Installing into /usr/local/include/plib/ and /usr/local/lib makes it 
+possible for the fgfs configure script to automatically locate the plib 
+includes and libs.