Article ID: 97809 - View products that this article applies to.
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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:
For version 7.0:
fatal error C1083: Cannot open include file: 'stdio.h':
The application compiles correctly in Microsoft C version 6.0 for MS-DOS.
fatal error C1024: cannot open include file 'stdio.h'
The INCLUDE environment variable specifies the root directory of a drive and a required header file is located in the root directory. This occurs most often when the MS-DOS SUBST command creates a drive letter for a subdirectory on a drive.
To work around this problem, edit your AUTOEXEC.BAT file to replace the backslash character (\) in the directory specification with a forward slash character (/). For example, the modified SET statement would appear as follows:
For a drive letter created with the SUBST command, omitting the backslash character entirely also works. For example:
Microsoft has confirmed this to be a bug in the products listed at the beginning 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.
The compiler uses the INCLUDE environment variable to specify the directories it searches for header files listed in the #include statement.
The MS-DOS SUBST command can be used to substitute a drive letter for a directory path. For more information on the SUBST command, please refer to your "MS-DOS User's Guide and Reference" manual. Also note that the online help for MS-DOS version 6.0 states "Do not use the SUBST command when you are running Windows."
Article ID: 97809 - Last Review: January 11, 2015 - Revision: 2.1