[CMake] ExternalProject_Add() Trouble Invoking Build Command to run the projects makefile

[David Starkweather]

set(HIREDIS_DIR ${CMAKE_CURRENT_SOURCE_DIR}/hiredis)
set(HIREDIS_INCLUDE_DIRS ${HIREDIS_DIR}/include)
ExternalProject_Add(hiredis
  URL https://github.com/redis/hiredis/archive/v0.9.0.tar.gz
  PREFIX ${CMAKE_CURRENT_BINARY_DIR}/hiredis
  SOURCE_DIR ${CMAKE_CURRENT_BINARY_DIR}/hiredis
  DOWNLOAD_DIR ${CMAKE_CURRENT_BINARY_DIR}/hiredis
  BUILD_IN_SOURCE 1
  CONFIGURE_COMMAND ""
  BUILD_COMMAND make static
  INSTALL_COMMAND "")
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