_PKG_CONFIG(m4_tolower([$1])[_cflags], [cflags], [$2])
_PKG_CONFIG(m4_tolower([$1])[_libs], [libs], [$2])
if test x$pkg_failed = xyes; then
_PKG_CONFIG(m4_tolower([$1])[_cflags], [cflags], [$2])
_PKG_CONFIG(m4_tolower([$1])[_libs], [libs], [$2])
if test x$pkg_failed = xyes; then