Garfield++: Add the patch to fix the missing headers and Set the environment variable HEED_DATABASE (#39904)

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

@@ -17,6 +17,11 @@ class Garfieldpp(CMakePackage):
     tags = ["hep"]
 
     maintainers("mirguest")
+    patch(
+        "https://gitlab.cern.ch/garfield/garfieldpp/-/commit/882c3023cfa89b45ca7a0c95ab1518454536e8e1.patch",
+        sha256="440bc8129c55168e6c45d39e4344911d48ddb13fd3f9ee05974b2ede46a23b93",
+        when="@4.0",
+    )
 
     variant("examples", default=False, description="Build garfield examples")
 
@@ -29,5 +34,24 @@ class Garfieldpp(CMakePackage):
     depends_on("geant4", when="+examples")
 
     def cmake_args(self):
-        args = [self.define_from_variant("WITH_EXAMPLES", "examples")]
+        args = [
+            "-DCMAKE_INSTALL_LIBDIR=lib",
+            self.define_from_variant("WITH_EXAMPLES", "examples"),
+        ]
         return args
+
+    def setup_run_environment(self, env):
+        env.set("GARFIELD_INSTALL", self.prefix)
+        env.set("HEED_DATABASE", self.prefix.share.Heed.database)
+
+        # In order to get Garfield work in python, need to setup both ROOT and GSL
+        pyver = self.spec["python"].version.up_to(2)
+        site_packages = "python{}/site-packages".format(pyver)
+        pypath = join_path(self.prefix.lib, site_packages)
+        env.prepend_path("PYTHONPATH", pypath)
+        env.prepend_path("LD_LIBRARY_PATH", self.spec["root"].prefix.lib.root)
+        env.prepend_path("LD_LIBRARY_PATH", self.spec["gsl"].prefix.lib.root)
+
+    def setup_dependent_build_environment(self, env):
+        env.set("GARFIELD_INSTALL", self.prefix)
+        env.set("HEED_DATABASE", self.prefix.share.Heed.database)