c -o mged-dm-ogl.o `test -f 'dm-ogl.c' || echo './'`dm-ogl.c
In file included from ../../include/dm-ogl.h:28,
                 from dm-ogl.c:64:
../../include/dm_color.h:27: error: parse error before "extern"
../../include/dm_color.h:27: warning: no semicolon at end of struct or union
dm-ogl.c: In function `Ogl_fb_open':
dm-ogl.c:157: error: dereferencing pointer to incomplete type
dm-ogl.c:158: error: dereferencing pointer to incomplete type
dm-ogl.c:159: error: dereferencing pointer to incomplete type
dm-ogl.c:160: error: dereferencing pointer to incomplete type
dm-ogl.c: In function `Ogl_doevent':
dm-ogl.c:173: error: dereferencing pointer to incomplete type
dm-ogl.c:174: error: dereferencing pointer to incomplete type
make[4]: *** [mged-dm-ogl.o] Error 1
make[4]: Leaving directory `/home/IriX64/brlcad-7.10.0/brlcad-7.10.0/src/mged'
make[3]: *** [all-recursive] Error 1
make[3]: Leaving directory `/home/IriX64/brlcad-7.10.0/brlcad-7.10.0/src/mged'
make[2]: *** [all] Error 2
make[2]: Leaving directory `/home/IriX64/brlcad-7.10.0/brlcad-7.10.0/src/mged'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/IriX64/brlcad-7.10.0/brlcad-7.10.0/src'
make: *** [all-recursive] Error 1

IriX64@FthrNtr ~/brlcad-7.10.0/brlcad-7.10.0
$