[Buildroot] ruby won't build :(

[Cristian Ionescu-Idbohrn]

/data/cii/buildroot/buildroot/build_i486/staging_dir/usr/bin/i486-linux-uclibc-gcc
-Os -pipe
-I/data/cii/buildroot/buildroot/build_i486/staging_dir/usr/include
 --sysroot=/data/cii/buildroot/buildroot/build_i486/staging_dir/ -isysroot
/data/cii/buildroot/buildroot/build_i486/staging_dir -g -O2 -rdynamic
-Wl,-export-dynamic main.o dmyext.o libruby-static.a -ldl -lcrypt -lm -o
miniruby

can't find header files for ruby.
make[1]: *** [all] Error 1


-- 
Cristian