disable GSL vector lib on MacOS x86

stepmania/src/RageMath.cpp

@@ -13,8 +13,13 @@
 #include "arch/Dialog/Dialog.h"
 #include <float.h>
 
-#if defined(MACOSX)
+#if defined(MACOSX) && defined(__ppc__)
+#	define USE_VECLIB
+#endif
+
+#if defined(USE_VECLIB)
 // Work around global namespace pollution.
+// www.gnu.org/software/gsl/manual/gsl-ref_43.html
 namespace vblas
 {
 # include <vecLib/vBLAS.h>
@@ -90,7 +95,7 @@ void RageVec3TransformNormal( RageVector3* pOut, const RageVector3* pV, const Ra
 
 void RageVec4TransformCoord( RageVector4* pOut, const RageVector4* pV, const RageMatrix* pM )
 {
-#if defined(MACOSX)
+#if defined(USE_VECLIB)
 	// (M^t * v)^t = v^t * M 
 	cblas_sgemv(CblasRowMajor, CblasTrans, 4, 4, 1, &pM->m00, 4, &pV->x, 1,
 				0, &pOut->x, 1);
@@ -135,7 +140,7 @@ RageMatrix RageMatrix::GetTranspose() const
 
 void RageMatrixMultiply( RageMatrix* pOut, const RageMatrix* pA, const RageMatrix* pB )
 {
-#if defined(MACOSX)
+#if defined(USE_VECLIB)
 	cblas_sgemm(CblasRowMajor, CblasNoTrans, CblasNoTrans, 4, 4, 4, 1,
 				&pB->m00, 4, &pA->m00, 4, 0, &pOut->m00, 4);
 #else