diff --git a/Formula/ngspice.rb b/Formula/ngspice.rb
index 52afff22f0b47..9bd0696bc1416 100644
--- a/Formula/ngspice.rb
+++ b/Formula/ngspice.rb
@@ -11,6 +11,7 @@ class Ngspice < Formula
   end
 
   option "without-xspice", "Build without x-spice extensions"
+  option "with-shared", "Build shared library"
 
   deprecated_option "with-x" => "with-x11"
 
@@ -29,6 +30,19 @@ def install
     end
     args << "--enable-xspice" if build.with? "xspice"
 
+    if build.with? "shared"
+      # The build system cannot build both the executable and the shared
+      # library in one sequence, see
+      # https://sourceforge.net/p/ngspice/support-requests/19 .
+      # But we can build the shared library first, clean up, and then build
+      # the executable.
+      args << "--with-ngshared"
+      system "./configure", *args
+      system "make", "install"
+      system "make", "clean"
+      args.pop
+    end
+
     system "./configure", *args
     system "make", "install"
   end