AC_DEFUN([AM_VSCPL_TARGET_API], [

    AC_CHECK_HEADERS([windows.h winsock2.h])

    test "$ac_cv_header_windows_h" = "yes" -a "$ac_cv_header_winsock2_h" = "yes"
    _target_win32=$?

    AM_CONDITIONAL([TARGET_API_WIN32], test $_target_win32 -eq 0)
    AM_CONDITIONAL([TARGET_API_WIN64], test $_target_win32 -eq 0 -a "$host_cpu" = "x86_64")
    AM_CONDITIONAL([TARGET_API_POSIX], test $_target_win32 -ne 0)
    if test $_target_win32 -eq 0; then
        if test "$host_cpu" = "x86_64"; then
           AC_DEFINE([TARGET_API_WIN64], [1], [Define if the target is the 64-bit Win32 API.])
        fi
        AC_DEFINE([TARGET_API_WIN32], [1], [Define if the target is the Win32 API.])
    else
        AC_DEFINE([TARGET_API_POSIX], [1], [Define if the target is the POSIX API.])
    fi

])

AC_DEFUN([AM_VSCPL], [
    PKG_CHECK_MODULES([VSCPL], [vscpl >= @VERSION@])
])