Error while installing package WvStreams

While installing the library WvStreams, I am getting the following errors....

* Generating CC, using c, . and ./.c.d
* Generating CXX, using cc, . and ./.cc.d
./CXX -c crypto/wvx509
crypto/wvx509.cc: In member function ‘WvString WvX509::get_extension(int) const’:
crypto/wvx509.cc:1160: error: invalid conversion from ‘const X509V3_EXT_METHOD*’ to ‘X509V3_EXT_METHOD*’
make: *** [crypto/wvx509.o] Error 1

Help required.
Thanks in advance.