Something

/bin/sh ../../../../libtool --silent --tag=CC --mode=link gcc  -pipe -fno-strict
-aliasing -fno-common -O3  -L/usr/X11R6/lib -L/usr/local/lib -pipe -fno-strict-a
liasing -fno-common -O3 -o rise_observer.exe -static rise_observer-main.o rise_o
bserver-observer.o -L/usr/local/lib -lSDL ../../../../src/adrt/libtienet/libtien
et.la ../../../../src/adrt/libtie/libtie.la ../../../../src/adrt/libtexture/libt
exture.la ../../../../src/adrt/libcommon/libcommon.la ../../../../src/adrt/libre
nder/librender.la ../../../../src/adrt/libutil/libutil.la -lpthread -lm ../../..
/../src/other/libz/libz.la
../../../../src/adrt/libutil/.libs/libutil.a(display.o):display.c:(.text+0x175):
 undefined reference to `_SDL_Flip'
../../../../src/adrt/libutil/.libs/libutil.a(display.o):display.c:(.text+0x237):
 undefined reference to `_SDL_UpperBlit'
../../../../src/adrt/libutil/.libs/libutil.a(display.o):display.c:(.text+0x2b9):
 undefined reference to `_SDL_UpperBlit'
../../../../src/adrt/libutil/.libs/libutil.a(display.o):display.c:(.text+0x2d1):
 undefined reference to `_SDL_FreeSurface'
../../../../src/adrt/libutil/.libs/libutil.a(display.o):display.c:(.text+0x2dd):
 undefined reference to `_SDL_FreeSurface'
../../../../src/adrt/libutil/.libs/libutil.a(display.o):display.c:(.text+0x2e9):
 undefined reference to `_SDL_FreeSurface'
../../../../src/adrt/libutil/.libs/libutil.a(display.o):display.c:(.text+0x30e):
 undefined reference to `_SDL_WasInit'
../../../../src/adrt/libutil/.libs/libutil.a(display.o):display.c:(.text+0x322):
 undefined reference to `_SDL_Init'
../../../../src/adrt/libutil/.libs/libutil.a(display.o):display.c:(.text+0x342):
 undefined reference to `_SDL_SetVideoMode'
../../../../src/adrt/libutil/.libs/libutil.a(display.o):display.c:(.text+0x35f):
 undefined reference to `_SDL_SetVideoMode'
../../../../src/adrt/libutil/.libs/libutil.a(display.o):display.c:(.text+0x38d):
 undefined reference to `_SDL_CreateRGBSurface'
../../../../src/adrt/libutil/.libs/libutil.a(display.o):display.c:(.text+0x3ef):
 undefined reference to `_SDL_CreateRGBSurface'
../../../../src/adrt/libutil/.libs/libutil.a(display.o):display.c:(.text+0x415):
 undefined reference to `_SDL_EnableUNICODE'
../../../../src/adrt/libutil/.libs/libutil.a(display.o):display.c:(.text+0x423):
 undefined reference to `_SDL_EnableKeyRepeat'
../../../../src/adrt/libutil/.libs/libutil.a(display.o):display.c:(.text+0x42d):
 undefined reference to `_SDL_Quit'
../../../../src/adrt/libutil/.libs/libutil.a(display.o):display.c:(.text+0x43b):
 undefined reference to `_SDL_GetError'
../../../../src/adrt/libutil/.libs/libutil.a(display.o):display.c:(.text+0x462):
 undefined reference to `_SDL_GetError'
../../../../src/adrt/libutil/.libs/libutil.a(display.o):display.c:(.text+0x52d):
 undefined reference to `_SDL_FillRect'
../../../../src/adrt/libutil/.libs/libutil.a(display.o):display.c:(.text+0x56c):
 undefined reference to `_SDL_FillRect'
../../../../src/adrt/libutil/.libs/libutil.a(display.o):display.c:(.text+0x5c4):
 undefined reference to `_SDL_UpperBlit'
../../../../src/adrt/libutil/.libs/libutil.a(display.o):display.c:(.text+0x619):
 undefined reference to `_SDL_UpperBlit'
../../../../src/adrt/libutil/.libs/libutil.a(display.o):display.c:(.text+0x66b):
 undefined reference to `_SDL_UpperBlit'
../../../../src/adrt/libutil/.libs/libutil.a(display.o):display.c:(.text+0x6c0):
 undefined reference to `_SDL_UpperBlit'
../../../../src/adrt/libutil/.libs/libutil.a(display.o):display.c:(.text+0x712):
 undefined reference to `_SDL_UpperBlit'
../../../../src/adrt/libutil/.libs/libutil.a(display.o):display.c:(.text+0x767):
 more undefined references to `_SDL_UpperBlit' follow
../../../../src/adrt/libutil/.libs/libutil.a(display.o):display.c:(.text+0xd52):
 undefined reference to `_SDL_Flip'
collect2: ld returned 1 exit status
make[4]: *** [rise_observer.exe] Error 1
make[4]: Leaving directory `/home/IriX64/brlcad-7.8.4/src/adrt/rise/observer'
make[3]: *** [all-recursive] Error 1
make[3]: Leaving directory `/home/IriX64/brlcad-7.8.4/src/adrt/rise'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/home/IriX64/brlcad-7.8.4/src/adrt'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/IriX64/brlcad-7.8.4/src'
make: *** [all-recursive] Error 1

IriX64@FthrNtr ~/brlcad-7.8.4
$