Problems compiling Vdrif on Slackware

[skilltik]

hi everyone!
first of all, sorry about my English, I'm writing from Argentina.

I'm trying to compile vdrift-2012-07-22 in Slackware linux, but I have one problem, this is my output :

bash-4.2# scons
scons: Reading SConscript files ...
Checking for C++ header file GL/gl.h... yes
Checking for C++ header file GL/glu.h... yes
Checking for C++ header file SDL/SDL.h... yes
Checking for C++ header file SDL/SDL_image.h... yes
Checking for C++ header file SDL/SDL_rotozoom.h... yes
Checking for C++ header file vorbis/vorbisfile.h... yes
Checking for C++ header file GL/glew.h... yes
Checking for C++ header file curl/curl.h... yes
Checking for C++ header file bullet/btBulletCollisionCommon.h... yes
Checking for C++ header file archive.h... yes
Checking for glDeleteSamplers(0, NULL) in C library GLEW... no
Your GLEW library is out of date.

I have installed Glew 1.9.0

some idea?
thx guys!