I see nine big reports for the DL_UNLOAD problem.

Here's a workaround.

in Zend/zend.h, find this line:

#define ZEND_EXTENSIONS SUPPORT 0

It's the last instance of ZEND_EXTENSIONS_SUPPORT in zend.h

JUST PRIOR TO THAT LINE, ADD THIS LINE:

#define DL_UNLOAD(libname)            ;

The semicolon at the right is important.   The code that runs for most
systems does not use Zend Extensions Support, and does not need
DL_UNLOAD, but somewhere an #ifdef is missing - I can't find it.  But
the #define you add above redefines their macro as ";" (no-op) which
should compile and link and load just fine.

Glen