あの・・すんません

bash-4.0# pwd
/usr/pkgsrc/pkgtools/x11-links
bash-4.0# make
ERROR: This package has set PKG_FAIL_REASON:
ERROR: x11-links-0.43 requires X headers to be installed
*** Error code 1

Stop.
make: stopped in /usr/pkgsrc/pkgtools/x11-links

こうなるんですけど、どうしたら・・