Include unistd.h (required because of usleep()) #649
Merged
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Compiling on MacOS catalina (./configure --with-drivers=pcsc) causes the error
pcsc.c:829:9: error: implicit declaration of function 'usleep' is invalid
in C99 [-Werror,-Wimplicit-function-declaration]
usleep(500000);//delay 500ms
Including unistd.h fixes this :-)