This article was previously published under Q97809
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An attempt to compile an application fails and Microsoft C/C++generates one of the following messages. For version 8.0:
fatal error C1083: Cannot open include file: 'stdio.h': Permission denied
For version 7.0:
fatal error C1024: cannot open include file 'stdio.h'
The application compiles correctly in Microsoft C version 6.0 forMS-DOS.
The INCLUDE environment variable specifies the root directory of adrive and a required header file is located in the root directory.This occurs most often when the MS-DOS SUBST command creates adrive letter for a subdirectory on a drive.
To work around this problem, edit your AUTOEXEC.BAT file to replacethe backslash character (\) in the directory specification with aforward slash character (/). For example, the modified SETstatement would appear as follows:
For a drive letter created with the SUBST command, omitting thebackslash character entirely also works. For example:
Microsoft has confirmed this to be a bug in the products listed at thebeginning of this article. This bug was corrected in C/C++ version 9.0,included with Visual C++ 32-bit Edition, version 2.0.
Perform the following two steps to demonstrate this problem.
Copy STDIO.H to the root directory on your C drive.
Enter the following at the MS-DOS command prompt:
set INCLUDE=C:\ cl TEST.C
If your C/C++ INCLUDE directory is C:\C700\INCLUDE, the error alsooccurs if you enter the following at the MS-DOS command prompt:
subst M: C:\C700\INCLUDE set INCLUDE=M:\ cl TEST.C
The compiler uses the INCLUDE environment variable to specify thedirectories it searches for header files listed in the #includestatement.
The MS-DOS SUBST command can be used to substitute a drive letter fora directory path. For more information on the SUBST command, pleaserefer to your "MS-DOS User's Guide and Reference" manual. Also notethat the online help for MS-DOS version 6.0 states "Do not use theSUBST command when you are running Windows."