+if(NOT DEFINED ENV{ENABLE_HASH_FNV64})
+ set(ENV{ENABLE_HASH_FNV64} ON)
+endif()
+option(ENABLE_HASH_FNV64 "enable fnv64 hash support"
+ $ENV{ENABLE_HASH_FNV64})
+if(NOT DEFINED ENV{ENABLE_HASH_MURMUR})
+ set(ENV{ENABLE_HASH_MURMUR} ON)
+endif()
+option(ENABLE_HASH_MURMUR "enable murmur hash support"
+ $ENV{ENABLE_HASH_MURMUR})
+if(NOT DEFINED ENV{ENABLE_MEMASLAP})
+ set(ENV{ENABLE_MEMASLAP} ON)
+endif()