GCC allows a bunch of non-ANSI-standard features that other compilers do not. In building on IBM's ANSI standard compiler, the following issues pop up.

Some of the issues fixed in this attached patch:

• Enumerations may not have a trailing comma on the last member
• Extra semicolons are not allowed outside of a function definition (common in the _DECL macros)
• uchar is often already defined. uchar should be switched to uint8_t, similar to the other new style types already in use by Zabbix.
• Arithmetic is not legal on void pointers. This was the biggest work to memalloc, using built in conversion from void * to a memory address pointer (char*), and casts where that wasn't normal.

I would also recommend using -ansi / -pedantic options with GCC to make sure Zabbix code stays ANSI compatible.