diff -up ./CMakeLists.txt.openmp ./CMakeLists.txt
--- ./CMakeLists.txt.openmp	2013-04-15 17:10:27.948397358 -0400
+++ ./CMakeLists.txt	2013-04-15 17:10:35.453663412 -0400
@@ -443,7 +443,7 @@ IF(CMAKE_COMPILER_IS_GNUCXX)
 
 	# Parallel stdlibc++?
 	IF(MRPT_ENABLE_LIBSTD_PARALLEL_MODE)
-		SET(EXTRA_CPP_FLAGS "${EXTRA_CPP_FLAGS} -D_GLIBCXX_PARALLEL -fopenmp")
+		SET(EXTRA_CPP_FLAGS "${EXTRA_CPP_FLAGS} -fopenmp")
 	ENDIF(MRPT_ENABLE_LIBSTD_PARALLEL_MODE)
 
 	IF(CMAKE_BUILD_TYPE MATCHES "Debug")