obsd build include trouble

[Jason Stover]

$ uname -ap
OpenBSD math.gcsu.edu 3.8 GENERIC#138 i386 Intel(R) Xeon(TM) CPU 2.80GHz 
("GenuineIntel" 686-class)

The following trouble happens with OBSD's make, not GNU make. (It works fine
with GNU make on this machine.)

$ ./configure --without-gui
...
$ make

...

depbase=`echo src/ui/terminal/command-line.o | sed 
's|[^/]*$|.deps/&|;s|\.o$||'`;  if gcc -DHAVE_CONFIG_H -I. -I. -I.  -I. -I./src 
-I./lib       -I./intl -I./gl -I./gl  -I/home/jhs/include -Wall -W 
-Wwrite-strings -Wstrict-prototypes  -Wpointer-arith -Wno-sign-compare 
-Wmissing-prototypes -Dunix  -g -O2 -MT src/ui/terminal/command-line.o -MD -MP 
-MF "$depbase.Tpo" -c -o src/ui/terminal/command-line.o 
src/ui/terminal/command-line.c;  then mv -f "$depbase.Tpo" "$depbase.Po"; else 
rm -f "$depbase.Tpo"; exit 1; fi
src/ui/terminal/command-line.c:22:21: message.h: No such file or directory
src/ui/terminal/command-line.c:28:19: alloc.h: No such file or directory
src/ui/terminal/command-line.c:29:22: copyleft.h: No such file or directory
src/ui/terminal/command-line.c:30:21: message.h: No such file or directory
src/ui/terminal/command-line.c:31:25: line-buffer.h: No such file or directory
src/ui/terminal/command-line.c:33:22: settings.h: No such file or directory
src/ui/terminal/command-line.c:35:20: output.h: No such file or directory
src/ui/terminal/command-line.c:36:22: filename.h: No such file or directory
src/ui/terminal/command-line.c:38:21: version.h: No such file or directory

I have message.h in ./src/libpspp/message.h , but there is no -I for this 
directory.

This kind of thing fixes the trouble:

     -#include "message.h"
     +#include <src/libpspp/message.h>

but I didn't think everyone else wanted these kinds of #include's, and
I don't know if anything should be changed just to make pspp build with
BSD make.

-Jason