Building librsvg out of a 2006.1 ~amd64 stage, librsvg fails because cairo is
not built with png support by default:
/bin/sh ./libtool --mode=link --tag=CC x86_64-pc-linux-gnu-gcc -O2 -pipe -o
rsvg-convert rsvg-convert.o -lgsf-1 -lgobject-2.0 -lxml2 -lz -lm -lglib-2.0
-lcroco-0.6 -lglib-2.0 -lxml2 -lz -lm -lgdk_pixbuf-2.0 -lxml2 -lm
-lpangoft2-1.0 -lpango-1.0 -lgobject-2.0 -lgmodule-2.0 -ldl -lglib-2.0 -lcairo
-lfontconfig -lexpat -lfreetype -lz -lpopt ./librsvg-2.la -lm
x86_64-pc-linux-gnu-gcc -O2 -pipe -o .libs/rsvg-convert rsvg-convert.o
/usr/lib64/libpopt.so ./.libs/librsvg-2.so /usr/lib64/libgsf-1.so
/usr/lib64/libcroco-0.6.so /usr/lib64/libgdk_pixbuf-2.0.so
/usr/lib64/libxml2.so /usr/lib64/libpangoft2-1.0.so /usr/lib64/libpango-1.0.so
/usr/lib64/libgobject-2.0.so /usr/lib64/libgmodule-2.0.so
/usr/lib64/libglib-2.0.so /usr/lib64/libcairo.so /usr/lib64/libXrender.so
/usr/lib64/libX11.so /usr/lib64/libXau.so /usr/lib64/libXdmcp.so -ldl
/usr/lib64/libfontconfig.so /usr/lib64/libexpat.so /usr/lib64/libfreetype.so
-lz -lm
rsvg-convert.o: In function `main':
rsvg-convert.c:(.text+0x90d): undefined reference to
`cairo_surface_write_to_png_stream'
collect2: ld returned 1 exit status
make[2]: *** [rsvg-convert] Error 1
make[2]: Leaving directory
`/var/tmp/portage/librsvg-2.14.3/work/librsvg-2.14.3'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory
`/var/tmp/portage/librsvg-2.14.3/work/librsvg-2.14.3'
make: *** [all] Error 2
Rebuilding cairo with png useflag fixes the problem. A pkg_setup to require
cairo to be built with png useflag would help here :)
HTH,
Diego
