- AC_CHECK_HEADER(png.h,
- AC_CHECK_LIB(png, png_get_channels, HAVE_PNG=yes, , -lz -lm))
+ # Debian unstable as of July 2003 has multiple libpngs, and puts png.h
+ # in /usr/include/libpng.
+ AC_CHECK_HEADERS(png.h libpng/png.h)
+ if test "$ac_cv_header_png_h" = yes || test "$ac_cv_header_libpng_png_h" = yes ; then
+ AC_CHECK_LIB(png, png_get_channels, HAVE_PNG=yes, , -lz -lm)
+ fi