===> Building for plist-utils-20180222
clang -O2    -c plist_getline.c
clang -O2    -c plist_tree.c
plist_tree.c:37:10: fatal error: 'sys/rbtree.h' file not found
#include <sys/rbtree.h>
         ^~~~~~~~~~~~~~
1 error generated.
*** Error code 1

Stop.
bmake: stopped in /var/pkgsrc/work/pkgtools/plist-utils/work/plist-utils-20180222
*** Error code 1

Stop.
bmake[1]: stopped in /usr/pkgsrc/pkgtools/plist-utils
*** Error code 1

Stop.
bmake: stopped in /usr/pkgsrc/pkgtools/plist-utils