X-Git-Url: http://git.dev.opencascade.org/gitweb/?p=occt.git;a=blobdiff_plain;f=src%2Fmath%2Fmath_Matrix.hxx;h=b5edbb4e0b98458d7f5e0f05495c4f794efa7729;hb=9fd2d2c3828d504bc7e8b8e204852b1bc9df02aa;hpb=e3d02d1f845e3bf789f6c2f651885c1979cb03e0

diff --git a/src/math/math_Matrix.hxx b/src/math/math_Matrix.hxx
index a729d83f2a..b5edbb4e0b 100644
--- a/src/math/math_Matrix.hxx
+++ b/src/math/math_Matrix.hxx
@@ -27,13 +27,11 @@
 #include <Standard_Address.hxx>
 #include <math_Vector.hxx>
 #include <Standard_OStream.hxx>
-class Standard_DimensionError;
-class Standard_RangeError;
-class Standard_DivideByZero;
-class math_NotSquare;
-class math_SingularMatrix;
-class math_Vector;
 
+// resolve name collisions with X11 headers
+#ifdef Opposite
+  #undef Opposite
+#endif
 
 //! This class implements the real matrix abstract data type.
 //! Matrixes can have an arbitrary range which must be defined