error in example min is not found in this code

[sairashaheen]

line of code is

ring_buffer_size_t elementsToWrite = min(elementsWriteable, (ring_buffer_size_t)(framesPerBuffer * NUM_CHANNELS));

error is

src/paex_record.c: In function ‘int recordCallback(const void_, void_, long unsigned int, const PaStreamCallbackTimeInfo_, PaStreamCallbackFlags, void_)’:
src/paex_record.c:209:117: error: ‘min’ was not declared in this scope
src/paex_record.c: In function ‘int playCallback(const void_, void_, long unsigned int, const PaStreamCallbackTimeInfo_, PaStreamCallbackFlags, void_)’:
src/paex_record.c:234:113: error: ‘min’ was not declared in this scope