cmake HAVE_SYSCONF_SYMBOL examples

google/mysql-protobuf storage/ndb/mcc/host_info/CMakeLists.txt :36 

CHECK_SYMBOL_EXISTS("sysconf" "unistd.h" HAVE_SYSCONF_SYMBOL)

google/mysql-protobuf storage/ndb/mcc/host_info/CMakeLists.txt :46 

endif(HAVE_SYSCONF_SYMBOL)