cmake HAVE_SYSINFO examples

DCMTK/dcmtk CMake/GenerateDCMTKConfigure.cmake :546 

CHECK_FUNCTION_EXISTS(sysinfo HAVE_SYSINFO)

apache/trafficserver CMakeLists.txt :408 

check_symbol_exists(sysinfo sys/sysinfo.h HAVE_SYSINFO)

H-uru/Plasma cmake/CompilerChecks.cmake :15 

check_cxx_symbol_exists("sysinfo" "sys/sysinfo.h" HAVE_SYSINFO)

ornladios/ADIOS2 thirdparty/EVPath/EVPath/CMakeLists.txt :651 

try_compile(HAVE_SYSINFO
  ${CMAKE_CURRENT_BINARY_DIR}
  ${CMAKE_CURRENT_SOURCE_DIR}/cmake/check_sysinfo.c
)