diff --git a/include/boost/regex/v4/basic_regex_creator.hpp b/include/boost/regex/v4/basic_regex_creator.hpp
index f5e3d0f0..89767569 100644
--- a/include/boost/regex/v4/basic_regex_creator.hpp
+++ b/include/boost/regex/v4/basic_regex_creator.hpp
@@ -403,10 +403,20 @@ re_syntax_base* basic_regex_creator<charT, traits>::append_set(
       if(flags() & regex_constants::collate)
       {
          // we need to transform our range into sort keys:
+#if BOOST_WORKAROUND(__GNUC__, < 3)
+         string_type in(3, charT(0));
+         in[0] = c1.first;
+         in[1] = c1.second;
+         s1 = this->m_traits.transform(in.c_str(), (in[1] ? in.c_str()+2 : in.c_str()+1));
+         in[0] = c2.first;
+         in[1] = c2.second;
+         s2 = this->m_traits.transform(in.c_str(), (in[1] ? in.c_str()+2 : in.c_str()+1));
+#else
          charT a1[3] = { c1.first, c1.second, charT(0), };
          charT a2[3] = { c2.first, c2.second, charT(0), };
          s1 = this->m_traits.transform(a1, (a1[1] ? a1+2 : a1+1));
          s2 = this->m_traits.transform(a2, (a2[1] ? a2+2 : a2+1));
+#endif
          if(s1.size() == 0)
             s1 = string_type(1, charT(0));
          if(s2.size() == 0)
@@ -451,8 +461,15 @@ re_syntax_base* basic_regex_creator<charT, traits>::append_set(
       string_type s;
       if(first->second)
       {
+#if BOOST_WORKAROUND(__GNUC__, < 3)
+         string_type in(3, charT(0));
+         in[0] = first->first;
+         in[1] = first->second;
+         s = m_traits.transform_primary(in.c_str(), in.c_str()+2);
+#else
          charT cs[3] = { first->first, first->second, charT(0), };
          s = m_traits.transform_primary(cs, cs+2);
+#endif
       }
       else
          s = m_traits.transform_primary(&first->first, &first->first+1);
diff --git a/include/boost/regex/v4/protected_call.hpp b/include/boost/regex/v4/protected_call.hpp
index d8b597f5..197c4556 100644
--- a/include/boost/regex/v4/protected_call.hpp
+++ b/include/boost/regex/v4/protected_call.hpp
@@ -31,6 +31,8 @@ class BOOST_REGEX_DECL abstract_protected_call
 {
 public:
    bool BOOST_REGEX_CALL execute()const;
+   // this stops gcc-4 from complaining:
+   virtual ~abstract_protected_call(){}
 private:
    virtual bool call()const = 0;
 };