How to use gemmlowp in C project?

Hello, I'm using a framwork named "darknet" which is coded by C programm lauguage. I realized parameters quantization in conv, and try to use gemmlowp in darknet. When I try to pack function "EightBitIntGemm" from C++ to C, here occurs an error: fatal error: cstdint: No such file or directory. Could you give me some advice kindly? 