krb5: Add `staticOnly` flag

pkgs/development/libraries/kerberos/krb5.nix

@@ -3,6 +3,9 @@
 
 # Extra Arguments
 , type ? ""
+# This is called "staticOnly" because krb5 does not support
+# builting both static and shared, see below.
+, staticOnly ? false
 }:
 
 let
@@ -22,6 +25,9 @@ stdenv.mkDerivation rec {
   outputs = [ "out" "dev" ];
 
   configureFlags = [ "--with-tcl=no" "--localstatedir=/var/lib"]
+    # krb5's ./configure does not allow passing --enable-shared and --enable-static at the same time.
+    # See https://bbs.archlinux.org/viewtopic.php?pid=1576737#p1576737
+    ++ optional staticOnly [ "--enable-static" "--disable-shared" ]
     ++ optional stdenv.isFreeBSD ''WARN_CFLAGS=""''
     ++ optionals (stdenv.buildPlatform != stdenv.hostPlatform)
        [ "krb5_cv_attr_constructor_destructor=yes,yes"