AC_DEFUN([MY_WINDOWS_API], [ AC_MSG_CHECKING([whether compiling for Windows API]) AC_COMPILE_IFELSE( [AC_LANG_SOURCE([[#ifdef _WIN32 #Here's a nickel, kid #endif]])], [Windows_API=no], [Windows_API=yes]) AC_MSG_RESULT([$Windows_API]) if test $Windows_API = yes; then AC_DEFINE([WINDOWS], 1, [Define if compiling for Windows API]) LIBS_SOCKETS="-lws2_32" else LIBS_SOCKETS= fi AC_SUBST([LIBS_SOCKETS]) ])