freebsd.pciconf: install configuration files

Co-Authored-By: Audrey Dutcher <audrey@rhelmot.io>

pkgs/os-specific/bsd/freebsd/pkgs/pciconf.nix

@@ -1,6 +1,7 @@
 {
   lib,
   mkDerivation,
+  pciutils,
 }:
 mkDerivation {
   path = "usr.sbin/pciconf";
@@ -11,6 +12,22 @@ mkDerivation {
     "debug"
   ];
 
+  postPatch = ''
+    cat >usr.sbin/pciconf/pathnames.h <<EOF
+    #include <paths.h>
+
+    #define	_PATH_DEVPCI	"/dev/pci"
+    #define	_PATH_PCIVDB	"$out/share/pci.ids"
+    #define	_PATH_LPCIVDB	"/red/herring"
+
+    EOF
+  '';
+
+  postInstall = ''
+    mkdir -p $out/share/misc
+    cp "${pciutils}/share/pci.ids" "$out/share/pci.ids"
+  '';
+
   meta.platorms = lib.platforms.freebsd;
   meta.mainProgram = "pciconf";
 }