Allow ghostscript to build with Spack dependencies (#4065)

var/spack/repos/builtin/packages/ghostscript/package.py

@@ -23,28 +23,59 @@
 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 ##############################################################################
 from spack import *
+import shutil
 
 
-class Ghostscript(Package):
+class Ghostscript(AutotoolsPackage):
     """An interpreter for the PostScript language and for PDF."""
 
     homepage = "http://ghostscript.com/"
     url = "https://github.com/ArtifexSoftware/ghostpdl-downloads/releases/download/gs921/ghostscript-9.21.tar.gz"
 
-    version('9.21', '6f60d7fcb5eef6a8bec5abedf21c6a7008a8c0c7')
+    version('9.21', '5f213281761d2750fcf27476c404d17f')
     version('9.18', '33a47567d7a591c00a253caddd12a88a')
 
-    parallel = False
+    depends_on('pkg-config', type='build')
 
+    depends_on('freetype@2.4.2:')
+    depends_on('jpeg')
+    depends_on('lcms')
+    depends_on('libpng')
     depends_on('libtiff')
+    depends_on('zlib')
 
     def url_for_version(self, version):
         baseurl = "https://github.com/ArtifexSoftware/ghostpdl-downloads/releases/download/gs{0}/ghostscript-{1}.tar.gz"
         return baseurl.format(version.joined, version.dotted)
 
-    def install(self, spec, prefix):
-        configure('--prefix={0}'.format(prefix),
-                  '--with-system-libtiff')
+    def patch(self):
+        """Ghostscript comes with all of its dependencies vendored.
+        In order to build with Spack versions of these dependencies,
+        we have to remove these vendored dependencies.
 
+        Note that this approach is also recommended by Linux from Scratch:
+        http://www.linuxfromscratch.org/blfs/view/svn/pst/gs.html
+        """
+        directories = ['freetype', 'jpeg', 'lcms2', 'libpng', 'zlib']
+        for directory in directories:
+            shutil.rmtree(directory)
+
+        filter_file('ZLIBDIR=src',
+                    'ZLIBDIR={0}'.format(self.spec['zlib'].prefix.include),
+                    'configure.ac', 'configure',
+                    string=True)
+
+    def configure_args(self):
+        return [
+            '--disable-compile-inits',
+            '--enable-dynamic',
+            '--with-system-libtiff',
+        ]
+
+    def build(self, spec, prefix):
         make()
+        make('so')
+
+    def install(self, spec, prefix):
         make('install')
+        make('soinstall')