pitrou commented on a change in pull request #7452:
URL: https://github.com/apache/arrow/pull/7452#discussion_r442127449



##########
File path: cpp/cmake_modules/Findutf8proc.cmake
##########
@@ -0,0 +1,51 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+if(UTF8PROC_ROOT)
+  find_library(
+    UTF8PROC_LIB
+    NAMES utf8proc
+          
"${CMAKE_SHARED_LIBRARY_PREFIX}utf8proc${CMAKE_SHARED_LIBRARY_SUFFIX}"
+    PATHS ${UTF8PROC_ROOT}
+    PATH_SUFFIXES ${LIB_PATH_SUFFIXES}
+    NO_DEFAULT_PATH)
+  find_path(UTF8PROC_INCLUDE_DIR
+            NAMES utf8proc.h
+            PATHS ${UTF8PROC_ROOT}
+            NO_DEFAULT_PATH
+            PATH_SUFFIXES ${INCLUDE_PATH_SUFFIXES})
+
+else()
+  find_library(
+    UTF8PROC_LIB
+    NAMES utf8proc
+          
"${CMAKE_SHARED_LIBRARY_PREFIX}utf8proc${CMAKE_SHARED_LIBRARY_SUFFIX}"
+    PATH_SUFFIXES ${LIB_PATH_SUFFIXES})
+  find_path(UTF8PROC_INCLUDE_DIR NAMES utf8proc.h PATH_SUFFIXES 
${INCLUDE_PATH_SUFFIXES})
+endif()
+
+find_package_handle_standard_args(utf8proc REQUIRED_VARS UTF8PROC_LIB 
UTF8PROC_INCLUDE_DIR)
+
+# CMake 3.2 does uppercase the FOUND variable
+if(UTF8PROC_FOUND OR utf8proc_FOUND)
+  set(utf8proc_FOUND TRUE)
+  add_library(utf8proc::utf8proc UNKNOWN IMPORTED)

Review comment:
       Why "UNKNOWN"?

##########
File path: cpp/thirdparty/versions.txt
##########
@@ -49,6 +49,7 @@ ARROW_THRIFT_BUILD_VERSION=0.12.0
 ARROW_THRIFT_BUILD_MD5_CHECKSUM=3deebbb4d1ca77dd9c9e009a1ea02183
 ARROW_ZLIB_BUILD_VERSION=1.2.11
 ARROW_ZSTD_BUILD_VERSION=v1.4.5
+ARROW_UTF8PROC_BUILD_VERSION=v2.5.0

Review comment:
       Can you keep this file in alphabetical order?




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