--- a/plugins/org.eclipse.core.filesystem/natives/unix/linux/Makefile
+++ b/plugins/org.eclipse.core.filesystem/natives/unix/linux/Makefile
@@ -20,10 +20,10 @@
 OS_TYPE = linux
 
 #Set this to be the location of your JRE
-JAVA_HOME = /usr/lib/jvm/java-1.5.0-ibm-1.5.0.9/
+#JAVA_HOME = /usr/lib/jvm/java-1.5.0-ibm-1.5.0.9/
 
 JDK_INCLUDE = -I ${JAVA_HOME}/include -I ${JAVA_HOME}/include/${OS_TYPE}
-OPT_FLAGS=-O -s -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64
+OPT_FLAGS=-O2 -g -s -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64
 
 core:
 	gcc $(OPT_FLAGS) -fPIC -c $(JDK_INCLUDE) -o $(CORE.O) $(CORE.C)