Comment # 13 on bug 953149 from Johannes Meixner

Dominique Leuenberger,
what about testing for the actual requirement
which is whether or not e_Fatal e_ExecStackUnderflow e_NeedInput
are defined in a Ghostscript header file?

Something like:

for error in e_Fatal e_ExecStackUnderflow e_NeedInput ; \
do grep -q "$error" /usr/include/ghostscript/*.h || need_patch="yes" ; \
done
if test -n "need_patch" ;
then ...