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{{keywords>freebsd,unix,uint,clang,gcc,cc,stdint,compile,compiling,c,unidentified,identifier}}
====== Use of undeclared identifier 'uint' when compiling in clang / gcc ======

===== Environment =====

  * FreeBSD
  * clang / gcc


===== Symptom =====

When attempting to compile a C program, in either ''clang'' or ''gcc'', you encounter an error similar to this one:

  myprogram.c:600:2: error: use of undeclared identifier 'uint'; did you mean 'int'?
          uint n=0;
          ^~~~
          int


===== Root Cause =====

''uint'' is not a [[https://en.wikipedia.org/wiki/C_data_types|standard C data type]], so it must be declared.


===== Solution =====

Include the ''sys/types.h'' header file before ''main'' in the C source file:

  #include <sys/types.h> 

The program should then compile.