dbus fails to build on DragonFly

["Jeremy C. Reed" <reed%reedmedia.net@localhost>]

Using DragonFly/i386 2.3.2-DEVELOPMENT with latest pkgsrc HEAD.

sysutils/dbus fails to build with:

...
configure:3321: cc -V >&5
gcc: couldn't run 
'/usr/libexec/gcc41/i386-pc-dragonflybsd-gcc--I/build/reed/tmp/pkgsrc/sysutils/dbus/work.reed/.buildlink/include':
 
No such file or directory
configure:3325: $? = 1
configure:3348: checking for C compiler default output file name
configure:3370: cc -O2 -pthread -I/home/reed/pkg/include -I/usr/include 
-I/home/reed/pkg/include -I/usr/include -L/home/reed/pkg/lib 
-Wl,-R/home/reed/pkg/lib -pthread -L/usr/lib -Wl,-R/usr/lib conftest.c 
-lpthread >&5
configure:3374: $? = 0
configure:3412: result: a.out
configure:3431: checking whether the C compiler works
configure:3441: ./a.out
/usr/libexec/ld-elf.so.2: /usr/lib/libpthread.so.0: Undefined symbol 
"__sys__exit"
configure:3445: $? = 1
configure:3452: error: in 
`/build/reed/tmp/pkgsrc/sysutils/dbus/work.reed/dbus-1.2.4.2permissive':
configure:3454: error: cannot run C compiled programs.
If you meant to cross compile, use `--host'.
See `config.log' for more details.

(That is from config.log.)

First notice above how the gcc--I line got merged.