jabraham17 opened a new issue, #49974:
URL: https://github.com/apache/arrow/issues/49974
### Describe the bug, including details regarding any error messages,
version, and platform.
I found that when explicitly specifying `-DCMAKE_LIBTOOL=/usr/bin/libtool`
on MacOS the build fails with
```
cmake_modules/BuildUtils.cmake:123 (message):
CMAKE_LIBTOOL does not appear to be Apple's libtool: /usr/bin/libtool
libtool -V output: Apple Inc. version cctools_ld-1266.8
Call Stack (most recent call first):
src/arrow/CMakeLists.txt:1047 (arrow_create_merged_static_lib)
```
I think this is an issue with `validate_apple_libtool` in
`cpp/cmake_modules/BuildUtils.cmake`, where `result_var` is not set to true if
the version does match
Changing the function to the following seems to work for me (adding the else
branch)
```cmake
function(validate_apple_libtool result_var item)
get_libtool_version("${item}" libtool_version)
if(NOT "${libtool_version}" MATCHES ".*cctools.+([0-9.]+).*")
set(${result_var}
FALSE
PARENT_SCOPE)
else()
set(${result_var}
TRUE
PARENT_SCOPE)
endif()
endfunction()
```
### Component(s)
C++
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