From 43e574f04fc2b612356a9805abe60b708b0b32c9 Mon Sep 17 00:00:00 2001
From: Greg Steuck <greg@nest.cx>
Date: Thu, 8 Sep 2022 21:52:19 -0700
Subject: Repair c++ probing on OpenBSD

Failure without this change:
```
checking C++ standard library flavour... libc++
checking for linkage against 'c++ c++abi'... failed
checking for linkage against 'c++ cxxrt'... failed
configure: error: Failed to find C++ standard library
```
---
 m4/fp_find_cxx_std_lib.m4 | 1 +
 1 file changed, 1 insertion(+)

(limited to 'm4')

diff --git a/m4/fp_find_cxx_std_lib.m4 b/m4/fp_find_cxx_std_lib.m4
index 24f78d0a6f..09f4524d89 100644
--- a/m4/fp_find_cxx_std_lib.m4
+++ b/m4/fp_find_cxx_std_lib.m4
@@ -75,6 +75,7 @@ EOF
         case $CXX_STD_LIB_FLAVOUR in
         c++)
             try_libs "-lc++ -lc++abi" "libc++.so" "c++ c++abi" || \
+            try_libs "-lc++ -lc++abi -lpthread" "libc++.so" "c++ c++abi pthread" || \
             try_libs "-lc++ -lcxxrt" "libc++.so" "c++ cxxrt" ||
             AC_MSG_ERROR([Failed to find C++ standard library]) ;;
         stdc++)
-- 
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