when i install libnet by sudo apt-get install libnet1, the program can not find libnet.h and I also can not find it at /usr/local/include or /usr/include. so i download the libnet and make it, but I get the errors
make -C lib/ lib
make[1]: Entering director `/home/liuqiang/workspace/libnet/lib'
gcc -O2 -Wall -Werror -Wno-unused -Wstrict-prototypes -Wmissing-prototypes -Wmissing-declarations -g -I../include -Iinclude -DTARGET_LINUX -c -o core/config.o core/config.c
cc1: warnings being treated as errors
core/config.c: In function ‘__libnet_internal__seek_section’:
core/config.c:87: error: ignoring return value of ‘fgets’, declared with attribute warn_unused_result
core/config.c: In function ‘__libnet_internal__get_setting’:
core/config.c:111: error: ignoring return value of ‘fgets’, declared with attribute warn_unused_result
make[1]: *** [core/config.o] error 1
make[1]:Leaving directory `/home/liuqiang/workspace/libnet/lib'
make: *** [lib] error 2
It's always the same: you need the libfoo-dev package to build against source code from library foo as the libfoo package merely ensures you can run the code.
So here for libnet1: run apt-get install libnet1-dev and you should be good to roll along.