freebsd.geom: split outputs; link gpart manpage

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

@@ -1,4 +1,5 @@
 {
+  lib,
   mkDerivation,
   libgeom,
   libufs,
@@ -18,6 +19,12 @@ let
       "sys/opencrypto"
     ];
 
+    outputs = [
+      "out"
+      "man"
+      "debug"
+    ];
+
     # libgeom needs sbuf and bsdxml but linker doesn't know that
     buildInputs = [
       libgeom
@@ -37,8 +44,19 @@ mkDerivation {
     "lib/Makefile.inc"
     "lib/geom"
   ];
+  outputs = [
+    "out"
+    "man"
+    "debug"
+  ];
 
   GEOM_CLASS_DIR = "${libs}/lib";
 
+  # link in man pages from libs
+  postInstall = ''
+    mkdir -p $man/share/man/man8
+    ln -s ${lib.getMan libs}/share/man/man8/*.8* $man/share/man/man8/
+  '';
+
   buildInputs = [ libgeom ];
 }

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

@@ -5,6 +5,13 @@
 }:
 mkDerivation {
   path = "lib/libgeom";
+
+  outputs = [
+    "out"
+    "man"
+    "debug"
+  ];
+
   buildInputs = [
     libbsdxml
     libsbuf