# SHELL += -x
  
  CXX ?= g++
  CC ?= gcc        # used for sph2pipe
  # CXX = clang++  # Uncomment these lines...
  # CC = clang     # ...to build with Clang.
  
  # Note: OpenFst requires a relatively recent C++ compiler with C++11 support,
  # e.g. g++ >= 4.7, Apple clang >= 5.0 or LLVM clang >= 3.3.
  OPENFST_VERSION ?= 1.6.7
  CUB_VERSION ?= 1.8.0
  OPENBLAS_VERSION ?= 0.3.5
  
  # Default features configured for OpenFST; can be overridden in the make command line.
  OPENFST_CONFIGURE ?= --enable-static --enable-shared --enable-far --enable-ngram-fsts
  
  OPENFST_VER_NUM := $(shell echo $(OPENFST_VERSION) | sed 's/\./ /g' | xargs printf "%d%02d%02d")
  ifeq ("$(shell expr $(OPENFST_VER_NUM) \< 10600)","1")
      $(error OpenFst-$(OPENFST_VERSION) is not supported. \
              Supported versions: >= 1.6.0)
  endif
  
  all: check_required_programs sph2pipe sclite openfst cub
  	@echo -e "
  
  "
  	@echo "Warning: IRSTLM is not installed by default anymore. If you need IRSTLM"
  	@echo "Warning: use the script extras/install_irstlm.sh"
  	@echo "All done OK."
  
  # make sure check_required_programs runs before anything else:
  sph2pipe sclite openfst sctk: | check_required_programs
  
  check_required_programs:
  	extras/check_dependencies.sh
  
  clean: openfst_cleaned sclite_cleaned
  
  openfst_cleaned:
  	$(MAKE) -C openfst-$(OPENFST_VERSION) clean
  
  
  sclite_cleaned:
  	$(MAKE) -C sctk clean
  
  distclean:
  	rm -rf openfst-$(OPENFST_VERSION)/
  	rm -rf sctk-2.4.10/
  	rm -rf sctk
  	rm -rf sph2pipe_v2.5/
  	rm -rf sph2pipe_v2.5.tar.gz
  	rm -rf sctk-2.4.10-20151007-1312Z.tar.bz2
  	rm -rf openfst-$(OPENFST_VERSION).tar.gz
  	rm -f openfst
  	rm -rf libsndfile-1.0.25{,.tar.gz} BeamformIt-3.51{,.tgz}
  	rm -f cub-$(CUB_VERSION).zip
  	rm -rf cub-$(CUB_VERSION)
  	rm -f cub
  
  
  .PHONY: openfst # so target will be made even though "openfst" exists.
  openfst: openfst_compiled openfst-$(OPENFST_VERSION)/lib
  	-rm -f openfst
  	-ln -s openfst-$(OPENFST_VERSION) openfst
  
  .PHONY: openfst_compiled
  openfst_compiled: openfst-$(OPENFST_VERSION)/Makefile
  	$(MAKE) -C openfst-$(OPENFST_VERSION) install MAKEOVERRIDES=
  
  openfst-$(OPENFST_VERSION)/lib: | openfst-$(OPENFST_VERSION)/Makefile
  	-cd openfst-$(OPENFST_VERSION) && [ -d lib64 ] && [ ! -d lib ] && ln -s lib64 lib
  
  # Add the -O flag to CXXFLAGS on cygwin as it can fix the compilation error
  # "file too big".
  ifeq ($(OSTYPE),cygwin)
    # Note: OSTYPE path is probably dead for latest cygwin64 (installed on 2016/11/11).
    openfst_add_CXXFLAGS = -O -Wa,-mbig-obj
  else ifeq ($(OS),Windows_NT)
    # This new OS path is confirmed working on Windows 10 / Cygwin64.
    openfst_add_CXXFLAGS = -O -Wa,-mbig-obj
  else
    openfst_add_CXXFLAGS =
  endif
  
  openfst-$(OPENFST_VERSION)/Makefile: openfst-$(OPENFST_VERSION) | check_required_programs
  	cd openfst-$(OPENFST_VERSION)/ && \
  	./configure --prefix=`pwd` $(OPENFST_CONFIGURE) CXX="$(CXX)" CXXFLAGS="$(CXXFLAGS) $(openfst_add_CXXFLAGS)" LDFLAGS="$(LDFLAGS)" LIBS="-ldl"
  
  
  openfst-$(OPENFST_VERSION): openfst-$(OPENFST_VERSION).tar.gz
  	tar xozf openfst-$(OPENFST_VERSION).tar.gz
  
  openfst-$(OPENFST_VERSION).tar.gz:
  	wget -T 10 -t 1 http://www.openfst.org/twiki/pub/FST/FstDownload/openfst-$(OPENFST_VERSION).tar.gz || \
  	wget -T 10 -t 3 http://www.openslr.org/resources/2/openfst-$(OPENFST_VERSION).tar.gz
  
  sclite: sclite_compiled
  
  .PHONY: sclite_compiled
  sclite_compiled: sctk sctk_configured
  	cd sctk; \
  	$(MAKE) CC="$(CC)" CXX="$(CXX)" all && $(MAKE) install && $(MAKE) doc
  
  sctk_configured: sctk sctk/.configured
  
  sctk/.configured: sctk
  	cd sctk; $(MAKE) config
  	touch sctk/.configured
  
  .PHONY: sctk
  sctk: sctk-2.4.10-20151007-1312Z.tar.bz2
  	tar xojf sctk-2.4.10-20151007-1312Z.tar.bz2 || \
        tar --exclude '*NONE*html' -xvojf sctk-2.4.10-20151007-1312Z.tar.bz2
  	rm -rf sctk && ln -s sctk-2.4.10 sctk
  
  sctk-2.4.10-20151007-1312Z.tar.bz2:
  	wget -T 10 -t 3 ftp://jaguar.ncsl.nist.gov/pub/sctk-2.4.10-20151007-1312Z.tar.bz2|| \
  	wget --no-check-certificate -T 10 http://www.openslr.org/resources/4/sctk-2.4.10-20151007-1312Z.tar.bz2
  
  sph2pipe: sph2pipe_compiled
  
  sph2pipe_compiled: sph2pipe_v2.5/sph2pipe
  
  sph2pipe_v2.5/sph2pipe: | sph2pipe_v2.5
  	cd sph2pipe_v2.5/; \
  	$(CC) -o sph2pipe  *.c -lm
  
  sph2pipe_v2.5: sph2pipe_v2.5.tar.gz
  	tar --no-same-owner -xzf sph2pipe_v2.5.tar.gz
  
  sph2pipe_v2.5.tar.gz:
  	wget -T 10 -t 3 http://www.openslr.org/resources/3/sph2pipe_v2.5.tar.gz || \
  	wget --no-check-certificate -T 10  https://sourceforge.net/projects/kaldi/files/sph2pipe_v2.5.tar.gz
  
  
  .PHONY: cub
  cub:
  	wget -T 10 -t 3 -O cub-$(CUB_VERSION).zip https://github.com/NVlabs/cub/archive/$(CUB_VERSION).zip
  	unzip -oq cub-$(CUB_VERSION).zip
  	rm -f cub
  	ln -s cub-$(CUB_VERSION) cub
  
  # OpenBLAS is not compiled by default. Run 'make -j openblas' in this directory to build.
  .PHONY: openblas
  openblas:
  	@-rm -rf OpenBLAS xianyi-OpenBLAS-*
  	wget -t3 -nv -O- $$( \
              wget -qO- 'https://api.github.com/repos/xianyi/OpenBLAS/releases/tags/v$(OPENBLAS_VERSION)' | \
              python -c 'import sys,json;print(json.load(sys.stdin)["tarball_url"])') | \
  	  tar xzf -
  	mv xianyi-OpenBLAS-* OpenBLAS
  	$(MAKE) PREFIX=$$(pwd)/OpenBLAS/install USE_THREAD=0 -C OpenBLAS all install