I have set up a Cygwin environment on my machine (Windows 8.1).pol@pol-lap1 ~/Downloads/software/database/firebird/Firebird-2.5.4.26856-0$ `set | grep unknown`BASH_VERSINFO=([0]=4 [1]=3 [2]=33 [3]=1 [4]=release [5]=x86_64-unknown-cygwin)                echo bash: $FUNCNAME(): \`${!OPTIND}': unknown argument 1>&2;                194,10xCelsius 194,unknown 198,offlinescanuncsectorct \However, when I do env | grep -i unknown, nothing is returned.pol@pol-lap1 ~/Downloads/software/database/firebird/Firebird-2.5.4.26856-0$ env | grep -i unknownpol@pol-lap1 ~/Downloads/software/database/firebird/Firebird-2.5.4.26856-0Notice, the environmental variable's value is 4 pol@pol-lap1 ~/Downloads/software/database/firebird$ echo $BASH_VERSINFO4Now, what I want to do is change the value of $BASH_VERSINFO[5] to x86_64-redhat-linux-gnu in order to fool the system into compiling a programme that I want.I tried to export BASH_VERSINFO[5]=x86_64-redhat-linux-info, but that changed nothing.Maybe I don't fully understand the difference between the set and the env commands in Linux. Why do I get a different value with set as with env?I would be grateful if anyone could shed any light on these issue and let me know what I can do to change my variable. 
Cygwin, bash, change an environmental variable?
bash;shell script;cygwin
 BASH_VERSINFO[5]=x86_64-redhat-linux-infoOutput:bash: BASH_VERSINFO: readonly variableBtw. see: Hacky method to unset readonly variable with gdb