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gcc -I include -g -Wall -fpic -DDEBUG -c src/mthread.c -o obj/mthread.o
src/mthread.c:67:21: error: static declaration of ‘gettid’ follows non-static declaration
   67 | static inline pid_t gettid(void) {
      |                     ^~~~~~
In file included from /usr/include/unistd.h:1218,
                 from src/mthread.c:14:
/usr/include/x86_64-linux-gnu/bits/unistd_ext.h:34:16: note: previous declaration of ‘gettid’ with type ‘__pid_t(void)’ {aka ‘int(void)’}
   34 | extern __pid_t gettid (void) __THROW;
      |                ^~~~~~
make: *** [Makefile:53: obj/mthread.o] Error 1