xpdf does not allow to use all xpdf.real options: you can't use some options with argument like '-enc', '-mattecolor', '-aa' or '-aaVector'. These options must be added in 'xpdf' script:
...
while [ "$#" -gt "0" ]; do
case "$1" in
-z|-g|-geometry|-remote|-rgb|-papercolor|-eucjp|-t1lib|-ps|-paperw|-paperh|-upw|-display|-fg|-foreground|-bg|-background|-font|-fn|-enc|-mattecolor|-aa|-aaVector)
...
xpdf does not allow to use all xpdf.real options: you can't use some options with argument like '-enc', '-mattecolor', '-aa' or '-aaVector'. These options must be added in 'xpdf' script:
... -g|-geometry| -remote| -rgb|-papercolo r|-eucjp| -t1lib| -ps|-paperw| -paperh| -upw|-display| -fg|-foreground |-bg|-backgroun d|-font| -fn|-enc| -mattecolor| -aa|-aaVector)
while [ "$#" -gt "0" ]; do
case "$1" in
-z|
...