Warning: skipping dependency checks.
src/ctc.c: In function ‘constant_time_memeq’:
src/ctc.c:14:5: error: ‘for’ loop initial declarations are only allowed in C99 mode
     for(size_t i = 0; i < len; i++)
     ^
src/ctc.c:14:5: note: use option -std=c99 or -std=gnu99 to compile your code

Error: Build error: Failed compiling object src/ctc.o