add pthread to external libs

gcontini

2019-11-30 806b1356e99ec4f51b32c567c720e7f6154203c9

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MACRO(EVAL_CONDITION name)
   IF(${ARGN})
     SET(${name} 1)
   ELSE(${ARGN})
     SET(${name} 0)
   ENDIF(${ARGN})
ENDMACRO(EVAL_CONDITION)