This is the file cmd.h that was missing from the ImageFX 1.50 Developer 
Kit.  It belongs in include/scan/

 PERMSSN    UID  GID    PACKED    SIZE  RATIO     CRC       STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                 1404    3864  36.3% -lh5- e388 Jun  6  1994 cmd.h
[generic]                  187     244  76.6% -lh5- af0e Jun  6  1994 readme
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total         2 files    1591    4108  38.7%            Jun  6  1994