syntastic highlighting errors not supported.

[D0n9X1n]

Expected Behavior

When I set the color theme to the solarized, you can see the error part is marked as red and underline.

Actual Behavior

When I set the color theme to the gruvbox, the error part is not appeared.

Is there any solutions to solve this?

Steps to Reproduce the Problem

1. install gruvbox and syntastic.
2. let g:syntastic_enable_highlighting=1
3. write the code with error.

Specifications

OS info:

$ uname -a
Darwin Snail 17.3.0 Darwin Kernel Version 17.3.0: Thu Nov  9 18:09:22 PST 2017; root:xnu-4570.31.3~1/RELEASE_X86_64 x86_64

vim info:

$ vim --version
VIM - Vi IMproved 8.0 (2016 Sep 12, compiled Jan  6 2018 15:48:06)
macOS version
Included patches: 1-1400
Compiled by Homebrew
Huge version without GUI.  Features included (+) or not (-):
+acl               +farsi             +mouse_sgr         -tag_any_white
+arabic            +file_in_path      -mouse_sysmouse    -tcl
+autocmd           +find_in_path      +mouse_urxvt       +termguicolors
-autoservername    +float             +mouse_xterm       +terminal
-balloon_eval      +folding           +multi_byte        +terminfo
+balloon_eval_term -footer            +multi_lang        +termresponse
-browse            +fork()            -mzscheme          +textobjects
++builtin_terms    -gettext           +netbeans_intg     +timers
+byte_offset       -hangul_input      +num64             +title
+channel           +iconv             +packages          -toolbar
+cindent           +insert_expand     +path_extra        +user_commands
-clientserver      +job               +perl              +vertsplit
+clipboard         +jumplist          +persistent_undo   +virtualedit
+cmdline_compl     +keymap            +postscript        +visual
+cmdline_hist      +lambda            +printer           +visualextra
+cmdline_info      +langmap           +profile           +viminfo
+comments          +libcall           +python            +vreplace
+conceal           +linebreak         -python3           +wildignore
+cryptv            +lispindent        +quickfix          +wildmenu
+cscope            +listcmds          +reltime           +windows
+cursorbind        +localmap          +rightleft         +writebackup
+cursorshape       -lua               +ruby              -X11
+dialog_con        +menu              +scrollbind        -xfontset
+diff              +mksession         +signs             -xim
+digraphs          +modify_fname      +smartindent       -xpm
-dnd               +mouse             +startuptime       -xsmp
-ebcdic            -mouseshape        +statusline        -xterm_clipboard
+emacs_tags        +mouse_dec         -sun_workshop      -xterm_save
+eval              -mouse_gpm         +syntax
+ex_extra          -mouse_jsbterm     +tag_binary
+extra_search      +mouse_netterm     +tag_old_static
   system vimrc file: "$VIM/vimrc"
     user vimrc file: "$HOME/.vimrc"
 2nd user vimrc file: "~/.vim/vimrc"
      user exrc file: "$HOME/.exrc"
       defaults file: "$VIMRUNTIME/defaults.vim"
  fall-back for $VIM: "/usr/local/share/vim"
Compilation: clang -c -I. -Iproto -DHAVE_CONFIG_H   -DMACOS_X -DMACOS_X_DARWIN  -g -O2 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1
Linking: clang   -L. -fstack-protector -L/usr/local/lib -L/usr/local/opt/libyaml/lib -L/usr/local/opt/openssl/lib -L/usr/local/opt/readline/lib  -L/usr/local/lib -o vim        -lncurses -liconv -framework AppKit   -mmacosx-version-min=10.13 -fstack-protector-strong -L/usr/local/lib  -L/usr/local/Cellar/perl/5.26.1/lib/perl5/5.26.1/darwin-thread-multi-2level/CORE -lperl -lm -lutil -lc -F/usr/local/opt/python/Frameworks -framework Python   -lruby.2.5.0 -lobjc

[D0n9X1n]

Change the gruvbox/color/gruvbox.vim line 770 as below.

" Syntastic: {{{

call s:HL('SyntasticError', s:red, s:none, s:underline, s:red)
call s:HL('SyntasticWarning', s:red, s:none, s:underline, s:red)

hi! link SyntasticErrorSign GruvboxRedSign
hi! link SyntasticWarningSign GruvboxYellowSign

" }}}

The result: