bobo@bobo-laptop:~/Downloads/hexinject$ sudo make
gcc -o hexinject hexinject.c -lpcap
In file included from hexinject.c:8:
hexinject.h:11:18: error: pcap.h: No such file or directory
hexinject.c:325: error: expected ‘)’ before ‘*’ token
hexinject.c:350: error: expected ‘)’ before ‘*’ token
hexinject.c:369: error: expected ‘)’ before ‘*’ token
hexinject.c:391: error: expected ‘)’ before ‘*’ token
hexinject.c: In function ‘main’:
hexinject.c:412: error: ‘pcap_t’ undeclared (first use in this function)
hexinject.c:412: error: (Each undeclared identifier is reported only once
hexinject.c:412: error: for each function it appears in.)
hexinject.c:412: error: ‘fp’ undeclared (first use in this function)
hexinject.c:413: error: storage size of ‘bpf’ isn’t known
hexinject.c:414: error: ‘PCAP_ERRBUF_SIZE’ undeclared (first use in this function)
make: *** [all] Error 1
bobo@bobo-laptop:~/Downloads/hexinject$ ls
argparser.h  hexdump.h  hexinject.c  hexinject.h  Makefile  pcap.h

sudo apt-get install libpcap-dev

# make
gcc -Wall -lpcap -o hexinject hexinject.c
/tmp/ccYufKqX.o: In function `inject_raw':
hexinject.c:(.text+0x28b4): undefined reference to `pcap_sendpacket'
/tmp/ccYufKqX.o: In function `sniff_hexstr':
hexinject.c:(.text+0x2a05): undefined reference to `pcap_next'
/tmp/ccYufKqX.o: In function `sniff_raw':
hexinject.c:(.text+0x2ace): undefined reference to `pcap_next'
/tmp/ccYufKqX.o: In function `inject_hexstr_loop':
hexinject.c:(.text+0x2df7): undefined reference to `pcap_geterr'
/tmp/ccYufKqX.o: In function `inject_raw_loop':
hexinject.c:(.text+0x2edd): undefined reference to `pcap_geterr'
/tmp/ccYufKqX.o: In function `main':
hexinject.c:(.text+0x3124): undefined reference to `pcap_findalldevs'
hexinject.c:(.text+0x3202): undefined reference to `pcap_lookupdev'
hexinject.c:(.text+0x3266): undefined reference to `pcap_create'
hexinject.c:(.text+0x32b7): undefined reference to `pcap_set_snaplen'
hexinject.c:(.text+0x32fc): undefined reference to `pcap_set_promisc'
hexinject.c:(.text+0x333e): undefined reference to `pcap_set_timeout'
hexinject.c:(.text+0x3389): undefined reference to `pcap_can_set_rfmon'
hexinject.c:(.text+0x33cd): undefined reference to `pcap_set_rfmon'
hexinject.c:(.text+0x3415): undefined reference to `pcap_activate'
hexinject.c:(.text+0x342c): undefined reference to `pcap_geterr'
hexinject.c:(.text+0x346d): undefined reference to `pcap_open_offline'
hexinject.c:(.text+0x34e2): undefined reference to `pcap_compile'
hexinject.c:(.text+0x34f5): undefined reference to `pcap_geterr'
hexinject.c:(.text+0x3536): undefined reference to `pcap_setfilter'
hexinject.c:(.text+0x3549): undefined reference to `pcap_geterr'
hexinject.c:(.text+0x3651): undefined reference to `pcap_close'
collect2: error: ld returned 1 exit status
Makefile:6: recipe for target 'all' failed
make: *** [all] Error 1