现在在最后一步，制作 gnudialer，我收到此错误：
dispo.h:71:1: warning: deprecated conversion from string constant to ‘char*’ [-Wwrite-strings]
dispo.h: In function ‘char* dispo2short(int)’:
dispo.h:78:16: warning: deprecated conversion from string constant to ‘char*’ [-Wwrite-strings]
dispo.h: In function ‘char* dispo2long(int)’:
dispo.h:86:16: warning: deprecated conversion from string constant to ‘char*’ [-Wwrite-strings]
gnudialer.cpp: In function ‘void doRedirect(const string&, const string&, const string&, const string&, const string&, const string&, const bool&)’:
gnudialer.cpp:111:47: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
gnudialer.cpp: In function ‘int main(int, char**)’:
gnudialer.cpp:310:10: error: ‘umask’ was not declared in this scope
gnudialer.cpp:1373:96: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
make: *** [thegnudialer] Error 1
有什么建议可以说明实际问题出在哪里吗？在万维网上进行了所谓的“google”搜索，但无济于事。