an error in open inventor compilation

[guernane redha <guernane_reda@xxxxxxxxx>]

i am trying to compile open inventor 2.1.5-9 on
mandrake 9.1
i get the error
make[1]: Entering directory
`/home/reda/Documents/openinventor2.1.5-9/inventor/lib'
/usr/bin/g++   -L//usr/lib -L../libimage
-L../libFL/src  -shared -Wl,--whole-archive   
-L/usr/X11R6/lib libInventor.a  -ljpeg -limage -lFL
-lX11 -lm -lGLU -lGL  -Wl,--no-whole-archive -o
libInventor.so
/usr/bin/ld: cannot find -lFL
collect2: ld returned 1 exit status
gmake[1]: *** [libInventor.so] Error 1

can you help me please

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