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pcap-config writes to the standard output various compiler and linker flags required to build a user program with libpcap. By default, it writes flags appropriate for building with a dynamically-linked version of libpcap; see below for static linking. Depending on the manner of libpcap installation, some options or their combinations may produce empty output - this is by design.
--help Produce a help message and exit.
--version Produce libpcap version and exit. The version is the contents of VERSION file in libpcap source tree rather than the result of \%pcap_lib_version (3PCAP).
--cflags Produce the -I compiler flag required to include libpcap's header files.
--libs Produce the -L and -l linker flags required to link with libpcap, including -l flags for libraries required by libpcap.
--additional-libs Produce the -L and -l linker flags for libraries required by libpcap, but not the -l flag to link with libpcap itself.
--static This option causes --libs and --additional-libs to produce linker flags appropriate for static linking with libpcap.
--static-pcap-only This option causes --libs and --additional-libs to produce linker flags appropriate for static linking with libpcap and dynamic linking with all other libraries, including libraries required by libpcap.
Before libpcap release 1.10.2 pcap-config did not treat invalid command-line options as an error. The --static-pcap-only flag became available in libpcap release 1.10.2. The --static flag became available in libpcap release 1.1.0.