cc -pipe -O   -pthread  -Wall -Wextra -Werror=implicit-function-declaration signal/sig2str.c -o signal/sig2str -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE  -lm -lpthread -lrt  -lrt -lcrypt
signal/sig2str.c: In function 'main':
signal/sig2str.c:9:12: error: 'SIG2STR_MAX' undeclared (first use in this function); did you mean 'UINTPTR_MAX'?
  char name[SIG2STR_MAX];
            ^~~~~~~~~~~
            UINTPTR_MAX
signal/sig2str.c:9:12: note: each undeclared identifier is reported only once for each function it appears in
signal/sig2str.c:10:7: error: implicit declaration of function 'sig2str'; did you mean 'strstr'? [-Werror=implicit-function-declaration]
  if ( sig2str(SIGUSR1, name) < 0 )
       ^~~~~~~
       strstr
signal/sig2str.c:9:7: warning: unused variable 'name' [-Wunused-variable]
  char name[SIG2STR_MAX];
       ^~~~
cc1: some warnings being treated as errors