Remove warnings with gcc 7+ #201
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Using -std=c99 causes gcc to define __STRICT_ANSI__ macro, which causes all non-ANSI function declarations to "disappear" from the standard headers. Use feature test macro _POSIX_C_SOURCE to make strdup() available even with strict C99 compliance for GCC.
gcc 7+ warns about format truncation. Use asprintf instead of snprintf.
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Saw this cool project on Hacker News. Here are some very small patches to eliminate warnings with gcc v7+ and add Fedora dev instructions