diff -ru irrlicht-1.7/source/Irrlicht/Makefile irrlicht-1.7.new/source/Irrlicht/Makefile
--- irrlicht-1.7/source/Irrlicht/Makefile	2010-01-31 16:03:28.000000000 +0100
+++ irrlicht-1.7.new/source/Irrlicht/Makefile	2010-02-06 22:18:58.533901567 +0100
@@ -56,16 +56,16 @@
 #Compiler flags
 CXXINCS = -I../../include -Izlib -Ijpeglib -Ilibpng
 CPPFLAGS += $(CXXINCS) -DIRRLICHT_EXPORTS=1
-CXXFLAGS += -Wall -pipe -fno-exceptions -fno-rtti -fstrict-aliasing
+CXXFLAGS += -Wall -pipe -O2 -march=i486 -mtune=i686 -fno-exceptions -fno-rtti -fstrict-aliasing
 ifndef NDEBUG
 CXXFLAGS += -g -D_DEBUG
 else
-CXXFLAGS += -fexpensive-optimizations -O3
+CXXFLAGS += -fexpensive-optimizations -O2
 endif
 ifdef PROFILE
 CXXFLAGS += -pg
 endif
-CFLAGS := -O3 -fexpensive-optimizations -DPNG_THREAD_UNSAFE_OK -DPNG_NO_MMX_CODE -DPNG_NO_MNG_FEATURES
+CFLAGS := -O2 -march=i486 -mtune=i686 -fexpensive-optimizations -DPNG_THREAD_UNSAFE_OK -DPNG_NO_MMX_CODE -DPNG_NO_MNG_FEATURES
 
 sharedlib sharedlib_osx: CXXFLAGS += -fPIC
 sharedlib sharedlib_osx: CFLAGS += -fPIC