--- Makefile.orig	2013-10-18 01:03:39.000000000 +0900
+++ Makefile	2014-06-17 21:34:34.000000000 +0900
@@ -1,15 +1,15 @@
-CC = gcc
-CFLAGS = -Wall
+CC ?= gcc
+CFLAGS += -Wall
 DEBUG = -g
 LIBS = -lm
-OPT = -O3
-MAXKMERLENGTH=31
-CATEGORIES=2
+#OPT = -O3
+MAXKMERLENGTH?=31
+CATEGORIES?=2
 DEF = -D MAXKMERLENGTH=$(MAXKMERLENGTH) -D CATEGORIES=$(CATEGORIES)
 PDFLATEX_VERSION := $(shell pdflatex --version 2> /dev/null)
 
 # Mac OS users: uncomment the following lines
-CFLAGS = -Wall -m64
+#CFLAGS = -Wall -m64
 
 # Sparc/Solaris users: uncomment the following line
 # CFLAGS = -Wall -m64
@@ -40,7 +40,7 @@
 OBJ = obj/tightString.o obj/run.o obj/splay.o obj/splayTable.o obj/graph.o obj/run2.o obj/fibHeap.o obj/fib.o obj/concatenatedGraph.o obj/passageMarker.o obj/graphStats.o obj/correctedGraph.o obj/dfib.o obj/dfibHeap.o obj/recycleBin.o obj/readSet.o obj/binarySequences.o obj/shortReadPairs.o obj/locallyCorrectedGraph.o obj/graphReConstruction.o obj/roadMap.o obj/preGraph.o obj/preGraphConstruction.o obj/concatenatedPreGraph.o obj/readCoherentGraph.o obj/utility.o obj/kmer.o obj/scaffold.o obj/kmerOccurenceTable.o obj/allocArray.o obj/autoOpen.o
 OBJDBG = $(subst obj,obj/dbg,$(OBJ))
 
-default : cleanobj zlib obj velveth velvetg doc
+default : cleanobj zlib obj velveth velvetg
 
 clean : clean-zlib
 	-rm obj/*.o obj/dbg/*.o ./velvet*