Quagga - zebra nie wykrywa lcap - błąd

Podczas kompilacji quaggi wyświetlił się mnie błąd:

tomasz@darkstar:~/quagga-0.99.17/zebra$ make
/bin/sh ../libtool --tag=CC   --mode=link gcc -fPIE -Os -fno-omit-frame-pointer -g -std=gnu99 -Wall -Wsign-compare -Wpointer-arith -Wbad-function-cast -Wwrite-strings -Wmissing-prototypes -Wmissing-declarations -Wchar-subscripts -Wcast-qual -pie  -o testzebra test_main.o zebra_rib.o interface.o connected.o debug.o zebra_vty.o kernel_null.o redistribute_null.o ioctl_null.o misc_null.o -lcap  ../lib/libzebra.la -lcrypt   -lrt
libtool: link: gcc -fPIE -Os -fno-omit-frame-pointer -g -std=gnu99 -Wall -Wsign-compare -Wpointer-arith -Wbad-function-cast -Wwrite-strings -Wmissing-prototypes -Wmissing-declarations -Wchar-subscripts -Wcast-qual -pie -o .libs/testzebra test_main.o zebra_rib.o interface.o connected.o debug.o zebra_vty.o kernel_null.o redistribute_null.o ioctl_null.o misc_null.o  -lcap ../lib/.libs/libzebra.so -lcrypt -lrt
../lib/.libs/libzebra.so: undefined reference to `cap_get_flag'
../lib/.libs/libzebra.so: undefined reference to `cap_set_proc'
../lib/.libs/libzebra.so: undefined reference to `cap_clear'
../lib/.libs/libzebra.so: undefined reference to `cap_free'
../lib/.libs/libzebra.so: undefined reference to `cap_init'
../lib/.libs/libzebra.so: undefined reference to `cap_set_flag'
collect2: ld returned 1 exit status
make: *** [testzebra] Błąd 1

Wiem jednak, że lcap istnieje... (sprawdzałem gcc -o main -lcap main.c - działało). Zatem co jest nie tak?