remove unneeded flag

Makefile

@@ -13,9 +13,6 @@ MOCKS_DIR = $(CURDIR)/tests/mocks
 HTTPS_GIT := https://github.com/cosmos/cosmos-sdk.git
 DOCKER := $(shell which docker)
 PROJECT_NAME = $(shell git remote get-url origin | xargs basename -s .git)
-# RocksDB is a native dependency, so we don't assume the library is installed.
-# Instead, it must be explicitly enabled and we warn when it is not.
-ENABLE_ROCKSDB ?= false
 
 # process build tags
 build_tags = netgo
@@ -64,10 +61,6 @@ ldflags = -X github.com/cosmos/cosmos-sdk/version.Name=sim \
 		-X "github.com/cosmos/cosmos-sdk/version.BuildTags=$(build_tags_comma_sep)" \
 		-X github.com/cometbft/cometbft/version.TMCoreSemVer=$(CMTVERSION)
 
-ifeq ($(ENABLE_ROCKSDB),true)
-  BUILD_TAGS += rocksdb
-  test_tags += rocksdb
-endif
 
 # DB backend selection
 ifeq (cleveldb,$(findstring cleveldb,$(COSMOS_BUILD_OPTIONS)))
@@ -78,9 +71,6 @@ ifeq (badgerdb,$(findstring badgerdb,$(COSMOS_BUILD_OPTIONS)))
 endif
 # handle rocksdb
 ifeq (rocksdb,$(findstring rocksdb,$(COSMOS_BUILD_OPTIONS)))
-  ifneq ($(ENABLE_ROCKSDB),true)
-    $(error Cannot use RocksDB backend unless ENABLE_ROCKSDB=true)
-  endif
   CGO_ENABLED=1
 endif
 # handle boltdb