PNG problem

[<spam turian student harvard edu>]

I recently somehow broke my png support. I then removed the RPM and
reinstalled libpng-1.0.1-1 (also later tried libpng-1.0.1-3 and
libpng-1.0.2-1). Anyway, when recompiling imlib, I get the following
error:

checking for png_read_info in -lpng... yes
checking for png.h... yes
checking for png_structp in png.h... no
configure: warning: *** Native PNG support will not be built (PNG library is too old) ***

Strange, since I have png_structp in png.h. Whatever, I edit configure
so that it ignores the error and compiles in PNG support. Then I run
into the following compile error:

save.c: In function `gdk_imlib_save_image':
save.c:342: `PNG_INTERLACE_NONE' undeclared (first use in this function)
save.c:342: (Each undeclared identifier is reported only once
save.c:342: for each function it appears in.)
save.c:343: `PNG_COMPRESSION_TYPE_BASE' undeclared (first use in this function)
save.c:343: `PNG_FILTER_TYPE_BASE' undeclared (first use in this function)
make: *** [save.lo] Error 1

Strange, these values are defined in my png.h file. hrm
Any ideas? Thanks

		Joseph