clang -O2  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations termios/tcgetsid.c -o termios/tcgetsid -D_POSIX_C_SOURCE=202405L  -lm  -lintl
termios/tcgetsid.c:5:9: error: type specifier missing, defaults to 'int' [-Werror,-Wimplicit-int]
pid_t (*foo)(int) = tcgetsid;
        ^
termios/tcgetsid.c:5:1: error: type specifier missing, defaults to 'int' [-Werror,-Wimplicit-int]
pid_t (*foo)(int) = tcgetsid;
^
termios/tcgetsid.c:5:7: error: function cannot return function type 'int (int)'
pid_t (*foo)(int) = tcgetsid;
      ^
termios/tcgetsid.c:5:21: error: use of undeclared identifier 'tcgetsid'
pid_t (*foo)(int) = tcgetsid;
                    ^
4 errors generated.
../out/minix/include/termios/tcgetsid.o:(.data+0x0): undefined reference to `tcgetsid'
clang: error: linker command failed with exit code 1 (use -v to see invocation)