../os/xsha1.c:36:10: fatal error: 'sha1.h' file not found
 #include <sha1.h>
          ^~~~~~~~
../os/xsha1.c:45:5: error: implicit declaration of function 'SHA1Init' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
    SHA1Init(ctx);
    ^
../os/xsha1.c:54:5: error: implicit declaration of function 'SHA1Update' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
    SHA1Update(sha1_ctx, data, size);
    ^
../os/xsha1.c:63:5: error: implicit declaration of function 'SHA1Final' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
    SHA1Final(result, sha1_ctx);
    ^