libdir should be /usr/lib64 in the pkg-config file Causes warnings like: [markmc@lak ~]# gcc -g -Wall $(pkg-config --cflags --libs libnl-1) test-libnl.c -o test-libnl /usr/bin/ld: skipping incompatible /usr/lib/libc.so when searching for -lc /usr/bin/ld: skipping incompatible /usr/lib/libc.a when searching for -lc
Fixed in libnl-1.0-0.10.pre5.2