> | II.2.4 Linux Environment To specify a search path for include files, an optional environment variable ASEM51INC can be defined: 1.) For bash, ksh, and sh:
>         ASEM51INC=<path>
>         export ASEM51INC
> 2.) For csh, tcsh, and zsh:
>         setenv ASEM51INC <path>
> <path> may be any number of directories separated by ':' characters. Be sure that the whole definition doesn't contain any blanks or tabs! If ASEM51INC is defined, the assembler searches the specified <path> for include files that can neither be found in the working directory, nor in the search path specified with the --includes option. The <path> directories will be searched from left to right. Examples: 1.) bash:
>           ASEM51INC=/usr/local/include/asem-51:~/micros/mcs51/inc
>           export ASEM51INC
> If include files can neither be found in the working directory, nor in the --includes path (if specified), the assembler searches next /usr/local/include/asem-51 and finally ~/micros/mcs51/inc. 2.) csh:
>           setenv ASEM51INC /usr/local/include/asem-51
If ASEM51INC is defined as above in .login, the assembler finally searches the directory /usr/local/include/asem-51 for include files. The maximum length of <path> is limited to 255 characters.