ola
anyhow, all in all: use the version of Gem you compiled/linked your Gem-external with.
yes that's the answer, compile with same Gem than the one you load ( it's mentionned on the wiki )...
for the dependency of our package to libcxcore.so.2, it's surprising as the package libcv1 provides libcxcore.so.1.. we'll check it...it must be an error somewhere..
saludos, sevy