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Like this may be:

awk 'BEGIN{FS="=";while(getline < "configfile") a[$1]=$2} <use variables as a["var1"],a["var2"],etc.>'

Awk doesn't have an eval so you can't just set arbitrary variable names in BEGIN.

What's your system? If you have GNU awk, you can just add 'BEGIN {' and '}' to your configfile, then do this:
...

if you only have these four variables, then source your file


. variables.txt

awk -v var1="$var1" -v var2="$var2" -v var3="$var3" -v var4="$var4" '{do your process and access the vairable...