Index: Makefile
===================================================================
--- Makefile	(revision 11597)
+++ Makefile	(working copy)
@@ -1,5 +1,7 @@
 MKOCTFILE ?= mkoctfile -Wall
 
+OCTAVE_CXXFLAGS := $(shell env -i PATH=$PATH $(MKOCTFILE) -p CXXFLAGS)
+
 all: __spatial_filtering__.oct __bilateral__.oct __custom_gaussian_smoothing__.oct \
 	__boundary__.oct bwlabel.oct bwfill.oct rotate_scale.oct hough_line.oct \
 	graycomatrix.oct __bwdist__.oct nonmax_supress.oct bwlabeln.oct
@@ -8,7 +10,7 @@
 	$(MKOCTFILE) $<
 
 bwlabeln.oct: bwlabeln.cc union-find.h++
-	CXXFLAGS='-g -O2 -std=c++0x -Wall' $(MKOCTFILE) $<
+	CXXFLAGS='$(OCTAVE_CXXFLAGS) -std=c++0x' $(MKOCTFILE) $<
 
 clean:
 	rm -f *.o octave-core core *.oct *~
