Unknown type name in .c file

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JeCo_264681
Level 5
Level 5
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I feel dumb asking this question. It is more of a C language question but I can't find a good answer from online search. I am using the PSoC5LP GCC compiler.
I create a new .C file in an existing project. When I declare a new variable as uint8 or uint16, it is flagged "unknown type name 'uint8'. " If  I declare it as int, the error goes away.  When I open other auto generated .C files, they have uint8 and uint16 variables.
Why can I not declare unsigned and size in a c file?

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It seems that either #include "cytypes.h" or #include "project.h" solves the problem. Thanks to both of you.

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