LinuxQuestions.org - [SOLVED] Iftop ./configure errors

Hey guys,

I'm having problems installing iftop.
Could you, please, help me out?

Thanks!
Code:
iftop-1.0pre2]# ./configure

checking build system type... x86_64-unknown-linux-gnu

checking host system type... x86_64-unknown-linux-gnu

checking target system type... x86_64-unknown-linux-gnu

checking for a BSD-compatible install... /usr/bin/install -c

checking whether build environment is sane... yes

checking for gawk... gawk

checking whether make sets $(MAKE)... yes

checking for gcc... gcc

checking for C compiler default output file name... a.out

checking whether the C compiler works... yes

checking whether we are cross compiling... no

checking for suffix of executables...

checking for suffix of object files... o

checking whether we are using the GNU C compiler... yes

checking whether gcc accepts -g... yes

checking for gcc option to accept ISO C89... none needed

checking for style of include used by make... GNU

checking dependency style of gcc... gcc3

checking how to run the C preprocessor... gcc -E

checking for grep that handles long lines and -e... /bin/grep

checking for egrep... /bin/grep -E

checking for ANSI C header files... yes

checking for sys/types.h... yes

checking for sys/stat.h... yes

checking for stdlib.h... yes

checking for string.h... yes

checking for memory.h... yes

checking for strings.h... yes

checking for inttypes.h... yes

checking for stdint.h... yes

checking for unistd.h... yes

checking sys/ioctl.h usability... yes

checking sys/ioctl.h presence... yes

checking for sys/ioctl.h... yes

checking sys/time.h usability... yes

checking sys/time.h presence... yes

checking for sys/time.h... yes

checking sys/sockio.h usability... no

checking sys/sockio.h presence... no

checking for sys/sockio.h... no

checking for unistd.h... (cached) yes

checking for an ANSI C-conforming const... yes

checking for size_t... yes

checking whether time.h and sys/time.h may both be included... yes

checking sys/dlpi.h usability... no

checking sys/dlpi.h presence... no

checking for sys/dlpi.h... no

checking for regcomp... yes

checking for select... yes

checking for strdup... yes

checking for strerror... yes

checking for strspn... yes

checking for library containing socket... none required

checking for library containing log... -lm

checking for gethostbyname... yes

checking for library containing inet_aton... none required

checking for library containing inet_pton... none required

checking for inet_aton... yes

checking for inet_pton... yes

checking size of u_int8_t... unknown type

checking size of u_int16_t... unknown type

checking size of u_int32_t... unknown type

checking for stdint.h... (cached) yes

checking for library containing getnameinfo... none required

checking for library containing gethostbyaddr_r... none required

checking how to call gethostbyaddr_r... 8 args, int return

checking gethostbyaddr_r usability... yes

checking where to find pcap.h... /include

checking for pcap_open_live in -lpcap... yes

checking pcap.h usability... yes

checking pcap.h presence... yes

checking for pcap.h... yes

checking for a curses library containing mvchgat... -lncursesw

checking POSIX threads compilation... CFLAGS= and LIBS=-lpthread

checking POSIX threads usability... configure: error: it fails. We probably guessed the wrong CFLAGS.