When I built cairo, it is failed. The messages are below:

 gcc -DHAVE_CONFIG_H -I. -I. -I.. -I. -I../pixman/src -I/home/haae/lib/upstream/pango/cvs/include/freetype2 -I/home/haae/lib/upstream/pango/cvs/include -I/home/haae/lib/upstream/pango/cvs/include -I/usr/include/libpng12 -I/usr/X11R6/include -I/usr/X11R6/include -Wall -Wextra -Wsign-compare -Werror-implicit-function-declaration -Wpointer-arith -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -Wmissing-declarations -Wnested-externs -Wpacked -Wswitch-enum -Wmissing-format-attribute -Wstrict-aliasing=2 -Winit-self -Wdeclaration-after-statement -Wold-style-definition -Wno-unused-parameter -fno-strict-aliasing -I/home/haae/lib/upstream/pango/cvs/include -ggdb3 -Wall -MT cairo-type1-subset.lo -MD -MP -MF .deps/cairo-type1-subset.Tpo -c cairo-type1-subset.c  -fPIC -DPIC -o .libs/cairo-type1-subset.o
cairo-type1-subset.c: In function `cairo_type1_font_subset_decrypt_eexec_segment':
cairo-type1-subset.c:376: error: implicit declaration of function `isspace'
cairo-type1-subset.c:376: warning: nested extern declaration of `isspace'
cairo-type1-subset.c: In function `skip_token':
cairo-type1-subset.c:396: warning: nested extern declaration of `isspace'
cairo-type1-subset.c: At top level:
cairo-type1-subset.c:705: warning: unused parameter 'name'
cairo-type1-subset.c:705: warning: unused parameter 'name_length'
cairo-type1-subset.c: In function `cairo_type1_font_subset_for_each_glyph':
cairo-type1-subset.c:827: warning: nested extern declaration of `isspace'
make[2]: *** [cairo-type1-subset.lo] error 1
make[2]: Leaving directory `/data/Src/CVS_List/cairo/Upstream_CVS/build/cairo/src'
make[1]: *** [all-recursive] error 1
make[1]: Leaving directory `/data/Src/CVS_List/cairo/Upstream_CVS/build/cairo'
make: *** [all] error 2