All Travis jobs fail with
```src/Socket.cpp: In static member function ‘static int Poco::Net::Socket::select(Poco::Net::Socket::SocketList&, Poco::Net::Socket::SocketList&, Poco::Net::Socket::SocketList&, const Poco::Timespan&)’:
src/Socket.cpp:151:47: error: invalid conversion from ‘char*’ to ‘int’ [-fpermissive]
src/Socket.cpp:164:49: error: invalid conversion from ‘char*’ to ‘int’ [-fpermissive]
```
From man strerror_r
```
int strerror_r(int errnum, char *buf, size_t buflen); /* XSI-compliant */
char *strerror_r(int errnum, char *buf, size_t bufle); /* GNU-specific */
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
The XSI-compliant version of strerror_r() is provided if:
(_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && ! _GNU_SOURCE
Otherwise, the GNU-specific version is provided.
```
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