libnetpbm library link seems missing

Issue

While compiling a program using gcc with 32 bits mode on a Red Hat Enterprise Linux 4.8, it throws an error. It seems that there is a missing link in /usr/lib/:

/usr/lib/libnetpbm.so; libnetpbm.so.10

E.g.

# gcc -m32 -lnetpbm -o test example.c/usr/bin/ld: skipping incompatible /usr/lib64/libnetpbm.so when searching for -lnetpbm  
/usr/bin/ld: skipping incompatible /usr/lib64/libnetpbm.a when searching for -lnetpbm  
/usr/bin/ld: cannot find -lnetpbm  
collect2: ld returned 1 exit statusAnd without 32 bits mode compilating process works fine.

# gcc -lnetpbm -o test example.c