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Embarcadero's compilers, old (Borland-based) and new (Clang-based), do have full support for Standard C. The Clang-based compiler is claiming, through the macro __STDC_VERSION__, to support C99 and C11, whereas the Borland-based compiler supports ANSI C, as it has for decades. However, their run-time library is exposing global functions beyond the scope of Standard C, for backwards compatibility with the older Borland products. One of these functions is `randomize`, which clashes with a function inside pngvalid.c that incidentally has the same name. Building libpng in "Strict ANSI C" mode, in which all Borland-specific globals are hidden (e.g. via `bcc32 -A`), would have been a workable solution for the Borland-based ANSI C compiler, but no such solution appears to exist for the Clang-based C90/C99/C11 compiler. Fortunately, renaming a private function inside a test program is a cost-free alternative fix. This is a cherry-pick of commit 6184164aa73ee764b1822f44d3db7619cf84f3fa from branch 'libpng18'.
External contributions to libpng -------------------------------- This "contrib" directory contains contributions which are not necessarily under the libpng license, although all are open source. They are not part of libpng proper and are not used for building the library, although some are used for testing the library via "make check".