FSUM3032
When using the include directory option (-I), specify a directory name.

Explanation

The -I option requires an option-argument that is the name of an include directory. This directory name can be a directory pathname or a data set name that begins with two slashes. The C/370™ compiler uses that directory name when searching for a header file specified on a #include statement in the C source file.

User response

Reenter the c89 command and specify the include directory name after the -I option. For example: 
c89 -I myinc myprog.c
Parent topic: FSUM