A few questions while porting

Hi,
Is there anyone who can help me with these issues?
1)
I'm getting this warning.
C:\Temp\Play2\lib\string_pair_enumeration-c.cpp(22) : warning
C4190: '<Unknown>' has C-linkage specified, but returns UDT
'StringPair' which is incompatible with C
        common\string_pair.hpp(14) : see declaration of
'StringPair'

As I recall, K&R "c" did not allow returning a struct, but aspell
does as part of the c interface. Is this a problem?

2)
In language.cpp   PosibErr<void> Language::setup(const String &
lang, const Config * config)
there is this code:
      while (getdata_pair(REPL, d, buf)) {
        to_lower(d.key);
        if (d.key == "rep") {
There is no to_lower() function in the global namespace. Do they
mean the acommon namespace or aspeller?

Thanks for your help,
Gary