__crt0_load_environment_file, in c1loadef.c, can overwrite memory
if the environment file djgpp.env does not have the expected syntax.
 
Demonstration:
 c:> copy con djgpp.env
 [info]
 any text without equal sign
 control/z
 c:> info
    <crashes my system>
The error occurs in the following part of c1loadef.c:
    while (*sp != '=')
       *dp   = *sp  ;
This bug can occur when a dos editor appends control/z to djgpp.env.
The last line processed than consists of the control/z alone.