makefile - C++ File Requires Library Support -

i'm trying compile simple program terminal utilizes condition_variable class. upon building, following error:

this file requires compiler , library support iso c++ 2011 standard. support experimental, , must enabled -std=c++11 or -std=gnu++11 compiler options.

in researching error here, added necessary flag make file, i'm still getting same error.

here makefile:

cxx=        g++ $(ccflags) main=       main.o dataclass=  dataclass.o objs =      $(main) $(dataclass)  libs=       -pthread  ccflags=    -g -std=c++11  all:        main  main:       $(main) $(dataclass)     $(cxx) -o main $(main) $(dataclass) $(libs)  dataclass:  $(dataclass)     $(cxx) -o dataclass $(dataclass) $(libs)  clean:     rm -f $(objs) $(objs:.o=.d)  realclean:     rm -f $(objs) $(objs:.o=.d) main   %.d:    %.cc $(shell) -ec '$(cc) -m $(cppflags) $< \     | sed '\''s/\($*\)\.o[ :]*/\1.o $@ : /g'\'' > $@; \     [ -s $@ ] || rm -f $@'  include $(objs:.o=.d) 

i'm sure i'm missing small , stupid i'm new makefiles, appreciated.

1. rewrite cxx cxx = g++
2. change ccflags cxxflags = -g -std=c++11, and
3. rewrite rules $(cxx) $(cxxflags) ....

$(cxx) $(cxxflags) replaced g++ -g -std=c++11. more of standard method defining makefile. here snippet of resulting makefile.

cxx = g++ main = main.o dataclass = dataclass.o objs = $(main) $(dataclass)  libs = -pthread  cxxflags = -g -std=c++11  all: main  main: $(objs)     $(cxx) $(cxxflags) $? -o $@ $(libs) 

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as side note, sure rule should defined such?

dataclass: $(dataclass)     $(cxx) $(cxxflags) $? -o $@ $(libs) 

should target not dataclass.o or $(dataclass) , prerequisite other file?

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note: i've included make automatic variables tidy makefile rules.

• $? - replaced prerequisites
• $@ - replaced target name