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 | | diff --git a/library/entropy_poll.c b/library/entropy_poll.c |  | index 4556f88..5248a25 100644 |  | --- a/library/entropy_poll.c |  | +++ b/library/entropy_poll.c |  | @@ -21,8 +21,10 @@ |  |   |  |  #if defined(__linux__) |  |  /* Ensure that syscall() is available even when compiling with -std=c99 */ |  | +#if !defined(_GNU_SOURCE) |  |  #define _GNU_SOURCE |  |  #endif |  | +#endif |  |   |  |  #if !defined(MBEDTLS_CONFIG_FILE) |  |  #include "mbedtls/config.h" | 
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