diff --git a/include/boost/regex/config.hpp b/include/boost/regex/config.hpp
index 70a9a472..fa102783 100644
--- a/include/boost/regex/config.hpp
+++ b/include/boost/regex/config.hpp
@@ -165,7 +165,7 @@
 
 // We don't make our templates external if the compiler
 // can't handle it:
-#if (defined(BOOST_NO_MEMBER_FUNCTION_SPECIALIZATIONS) || defined(__MWERKS__) || defined(__COMO__) || defined(__ICL) || defined(__ICC))\
+#if (defined(BOOST_NO_MEMBER_FUNCTION_SPECIALIZATIONS) || defined(__HP_aCC) || defined(__MWERKS__) || defined(__COMO__) || defined(__ICL) || defined(__ICC))\
    && !defined(BOOST_MSVC) && !defined(__BORLANDC__)
 #  define BOOST_REGEX_NO_EXTERNAL_TEMPLATES
 #endif
@@ -644,3 +644,4 @@ inline void pointer_construct(T* p, const T& t)
 
 
 
+
diff --git a/include/boost/regex/v3/regex_compile.hpp b/include/boost/regex/v3/regex_compile.hpp
index a8613433..505353af 100644
--- a/include/boost/regex/v3/regex_compile.hpp
+++ b/include/boost/regex/v3/regex_compile.hpp
@@ -1266,6 +1266,10 @@ unsigned int BOOST_REGEX_CALL reg_expression<charT, traits, Allocator>::set_expr
 # ifdef BOOST_MSVC
 #  pragma warning(push)
 #  pragma warning(disable: 4127)
+#endif
+#ifdef __OpenBSD__
+   // strxfrm not working on OpenBSD??
+   f |= regbase::nocollate;
 #endif
 
    if(p == expression())
@@ -2110,3 +2114,4 @@ void BOOST_REGEX_CALL reg_expression<charT, traits, Allocator>::fail(unsigned in
 
 
 
+