Re: configure.ac: Fix breakage caused by -Werror=unused-variable

[Alexandre Julliard]

Daniel Santos  writes:
> When configuring with CFLAGS="-Wunused-variable -Werror", the configure
> test for HAVE_PNG_SET_EXPAND_GRAY_1_2_4_TO_8 fails with unused variable.

Running configure with -Werror is not a good idea. Is there a particular
reason why you need this?