MariaDB 5.3.5, 5.2.10 and possibly other versions, fails to compile using Apple's Clang compiler. As of Xcode 4.3, Clang is the default compiler, replacing LLVM-GCC.

The issue seems to occur when checking for an ABI incompatibility in mysql.h. As Clang preprocesses the file differently than GCC, the output is different, which fails the abi_check.

MariaDB compiles fine using the non-default LLVM-GCC compiler.