extern (
C++)
static if(versionIsSet!("Windows") && !defined!"M_PI" && !defined!"_BSD_SOURCE" && !defined!"_GNU_SOURCE" && !defined!"_POSIX_C_SOURCE" && !defined!"_POSIX_SOURCE" && !defined!"_USE_MATH_DEFINES" && !defined!"_XOPEN_SOURCE" && !versionIsSet!("Cygwin") && defined!"__STRICT_ANSI__")