According to the web page above...
PostgreSQL 6.4 release has a minor bug. I does not includ
by default the crypt lib when compiling libpgtcl. So, you
will need to manually add a -lcrypt to
SHLIB line in Makefile in src/interfaces/libpgtcl and then
make clean and make again. The new libpgtcl.so library is
properly configured to run pgaccess.
*** This bug has been marked as a duplicate of 2698 ***