/usr/include/stdio.h:140: parse error before `__gnuc_va_list'

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http://unix.stackexchange.com – I keep getting this error, when trying to compile my C program in SCO (using gcc). I have had a look on Google, and found this other forum: Linux Questions, and that guy had the exact same issue as I am getting. So I tried his solution, which is adding a line at the top of the program.c file: #include "err.h" I tried compiling again, and now I get one line back: program.c:5: err.h: No such file or directory Do I need to add / install to get that file? Where would this file be in my file-system? Thanks in advance. (HowTos)