[Help-smalltalk] make fails with open GL/glu.h missing

[LordGeoffrey]

Any suggestions on how to avoid this problem:

make[2]: Entering directory 
`/home/geoffrey/Downloads/smalltalk/smalltalk-3.1/packages/opengl'
/bin/bash ../../libtool --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H 
-I. -I../..  -I../../libgst -I../../lib-src   -g -O2 -Wall 
-Wdeclaration-after-statement -Wno-format -Wpointer-arith 
-Wno-pointer-sign -Wwrite-strings -Wno-strict-aliasing -Wno-switch 
-fno-gcse -fstrict-aliasing  -MT gstopengl.lo -MD -MP -MF 
.deps/gstopengl.Tpo -c -o gstopengl.lo gstopengl.c
gcc -DHAVE_CONFIG_H -I. -I../.. -I../../libgst -I../../lib-src -g -O2 
-Wall -Wdeclaration-after-statement -Wno-format -Wpointer-arith 
-Wno-pointer-sign -Wwrite-strings -Wno-strict-aliasing -Wno-switch 
-fno-gcse -fstrict-aliasing -MT gstopengl.lo -MD -MP -MF 
.deps/gstopengl.Tpo -c gstopengl.c  -fPIC -DPIC -o .libs/gstopengl.o
In file included from gstopengl.c:53:
gstopengl.h:60:18: error: GL/glu.h: No such file or directory
make[2]: *** [gstopengl.lo] Error 1
make[2]: Leaving directory 
`/home/geoffrey/Downloads/smalltalk/smalltalk-3.1/packages/opengl'
make[1]: *** [OpenGL.star] Error 2
make[1]: Leaving directory 
`/home/geoffrey/Downloads/smalltalk/smalltalk-3.1'
make: *** [check-recursive] Error 1