====== _dll function changes ======

In VO, the following _dll declaration is correct:
<code visualfoxpro>_DLL function zLibCompress( ptrDest as ptr, nBytesOut ref long, ptrSource as ptr, nBytesIn as long ) as int:zlib.compress</code>

This function has the C calling convention (comes from the Linux/Unix world), and therefore the ''pascal'' calling convention is not specified.

In X# this declaration does not compile, you have to add the ''strict'' calling convention
<code visualfoxpro>_DLL function zLibCompress( ptrDest as ptr, nBytesOut ref long, ptrSource as ptr, nBytesIn as long ) as int strict:zlib.compress</code>