# \[cxx feature check\] what satisfies GNU\_POSIX\_REGEX | POSIX\_REGEX?
**URL:** https://discourse.cmake.org/t/cxx-feature-check-what-satisfies-gnu-posix-regex-posix-regex/2218
**Category:** Usage
**Created:** [November 23, 2020, 12:48pm UTC](https://discourse.cmake.org/t/cxx-feature-check-what-satisfies-gnu-posix-regex-posix-regex/2218 "2020-11-23T12:48:55Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@\_0.z](https://discourse.cmake.org/u/_0.z)
#### Post date: [November 23, 2020, 12:48pm UTC](https://discourse.cmake.org/t/cxx-feature-check-what-satisfies-gnu-posix-regex-posix-regex/2218/1 "2020-11-23T12:48:55Z")
trying to compile llvm 11 from source with cmake 3.19, former pulling in Google’s benchmarking [https://github.com/google/benchmark/blob/master/CMakeLists.txt#L263](https://github.com/google/benchmark/blob/master/CMakeLists.txt#L263) which tests for
- GNU\_POSIX\_REGEX
- POSIX\_REGEX
and the test fails as apparently neither is available on the node.
since the node is based on the Debian package feed I was trying to find a package that satisfies either one but came up empty.
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### Author:  [@\_0.z](https://discourse.cmake.org/u/_0.z)
#### Post date: [November 23, 2020, 1:48pm UTC](https://discourse.cmake.org/t/cxx-feature-check-what-satisfies-gnu-posix-regex-posix-regex/2218/2 "2020-11-23T13:48:58Z")
installed `libghc-regex-posix-prof` package but that did not help
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### Author:  [@\_0.z](https://discourse.cmake.org/u/_0.z)
#### Post date: [November 23, 2020, 4:06pm UTC](https://discourse.cmake.org/t/cxx-feature-check-what-satisfies-gnu-posix-regex-posix-regex/2218/3 "2020-11-23T16:06:14Z")
package _gnulib_ should be satisfactory but it seems that the benchmark code is buggy.