[CMake] how to add custom command/step to ExternalProject_Add ?

[jagernicolas at legtux.org]

Hi, 

my question is related to :
http://stackoverflow.com/questions/36506300/using-autogen-sh-with-externalproject-add
[1] 

I have to use ExternalProject_Add to compile
https://github.com/fukuchi/libqrencode [2] as a gitmodule, it requires
to run autogen.sh before running configure. 

I don't understand how to use ExternalProject_Add_Step to add a step
before CONFIGURE_COMMAND. 

regards, 

Nicolas 

 

Links:
------
[1]
http://stackoverflow.com/questions/36506300/using-autogen-sh-with-externalproject-add
[2] https://github.com/fukuchi/libqrencode
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