I think I know why it worked for you. "dhcpv4.h" includes "pcap.h", which includes "libradius.h" (but only with "HAVE_LIBPCAP"). I don't have libpcap. I suspect you do. :)
About this error:
src/protocols/dhcpv4/decode.c: In function ‘fr_dhcpv4_decode_option’: src/protocols/dhcpv4/decode.c:376:55: error: ‘FR_VENDOR_SPECIFIC’ undeclared (first use in this function); did you mean ‘_SC_DEVICE_SPECIFIC’? parent = fr_dict_attr_child_by_num(packet_ctx->root, FR_VENDOR_SPECIFIC); ^~~~~~~~~~~~~~~~~~ _SC_DEVICE_SPECIFIC
It works for me, which is a bit weird. But I've pushed a fix.
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