; check CALIBRE_HOME              
;
cal_home=getShellEnvVar("CALIBRE_HOME")
;
if( cal_home==nil then
    cal_home=getShellEnvVar("MGC_HOME")
    if( cal_home!=nil then
        printf("// CALIBRE_HOME environment variable not set; setting it to value of MGC_HOME\n");          
    )              
)            
if( cal_home!=nil && isDir(cal_home) && isReadable(cal_home) then
    ; Load calibre.skl or calibre.4.3.skl, not both!
    ; Load calibre.skl for Cadence versions 4.4 and greater
    load(strcat(cal_home "/lib/calibre.skl"))
;        
else
    ; CALIBRE_HOME is not set correctly. Report the problem.
    printf("//  Calibre Error: Environment variable ")                                                         ;                        
    if( cal_home==nil || cal_home=="" then
        printf("CALIBRE_HOME is not set.");      
    else 
        if( !isDir(cal_home) then
            printf("CALIBRE_HOME does not point to a directory.");   
        else
            if( !isReadable(cal_home) then 
                printf("CALIBRE_HOME points to an unreadable directory.");
            )      
        )          
    )
    printf(" Calibre Skill Interface not loaded.\n")
    ; Display a dialog box message about load failure.
    hiDisplayAppDBox( 
        ?name           'MGCHOMEErrorDlg  
        ?dboxBanner     "Calibre Error" 
        ?dboxText       "Calibre Skill Interface not loaded."
        ?dialogType     hicErrorDialog 
        ?dialogStyle    'modal
        ?buttonLayout   'Close          
    )             
)