xcalc: new formula

Closes #848.

Signed-off-by: Maxim Belkin <maxim.belkin@gmail.com>

Author: maxim-belkin

Formula/xcalc.rb

@@ -0,0 +1,31 @@
+class Xcalc < Formula
+  desc "Scientific calculator for X"
+  homepage "https://www.x.org/"
+  url "https://www.x.org/pub/individual/app/xcalc-1.1.3.tar.xz"
+  sha256 "86e157b6174678675a4a912995dccd0ff4e2ce32b01bdd6f91bfe93333324980"
+  license "MIT"
+
+  depends_on "pkg-config" => :build
+  depends_on "util-macros" => :build
+  depends_on "libx11"
+  depends_on "libxaw"
+  depends_on "libxt"
+
+  def install
+    args = %W[
+      --prefix=#{prefix}
+      --sysconfdir=#{etc}
+      --localstatedir=#{var}
+      --disable-dependency-tracking
+      --disable-silent-rules
+    ]
+
+    system "./configure", *args
+    system "make"
+    system "make", "install"
+  end
+
+  test do
+    assert_predicate bin/"xcalc", :executable?
+  end
+end

README.md

@@ -70,19 +70,21 @@ All classic X11 bitmap and outline fonts, plus encodings and the `xorg-fonts` me
     * font-misc-cyrillic
     * font-misc-ethiopic
 
-### X.org Utilities (27)
+### X.org Utilities (31)
 
 Display, keyboard, and window management tools, plus the `xorg-apps` meta-package:
 
-    * iceauth          * xcursorgen        * xkill
-    * sessreg          * xdriinfo          * xlsatoms
-    * setxkbmap        * xev               * xmessage
-    * smproxy          * xgamma            * xorg-apps
-    * x11perf          * xhost             * xpr
-    * xbacklight       * xkbevd            * xrandr
-    * xcmsdb           * xkbutils          * xrefresh
-    * xcursor-themes   * xset              * xvinfo
-    * xsetroot         * xwd               * xwud
+    * iceauth          * xcursorgen        * xkbutils
+    * sessreg          * xdriinfo          * xkill
+    * setxkbmap        * xev               * xlsatoms
+    * smproxy          * xeyes             * xmessage
+    * x11perf          * xgamma            * xorg-apps
+    * xbacklight       * xhost             * xpr
+    * xcalc            * xkbevd            * xrandr
+    * xclipboard       * xrefresh          * xvinfo
+    * xcmsdb           * xset              * xwd
+    * xcompmgr         * xsetroot          * xwud
+    * xcursor-themes
 
 ### Libraries (10)