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diff --git a/var/spack/repos/builtin/packages/hto4l/package.py b/var/spack/repos/builtin/packages/hto4l/package.py
new file mode 100644
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+++ b/var/spack/repos/builtin/packages/hto4l/package.py
@@ -0,0 +1,37 @@
+# Copyright 2013-2022 Lawrence Livermore National Security, LLC and other
+# Spack Project Developers. See the top-level COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+from spack import *
+
+
+class Hto4l(MakefilePackage):
+    """Hto4l is an event generator for the SM Higgs decay into 4 charged leptons
+    up to NLOPS electroweak accuracy and in presence of dimension-6 operators."""
+
+    homepage = "https://www2.pv.infn.it/~hepcomplex/hto4l.html"
+    url      = "http://www2.pv.infn.it/~hepcomplex/releases/hto4l/Hto4l-v2.02.tar.bz2"
+
+    maintainers = ['haralmha']
+
+    version('2.02', sha256='1a7061689ddaf6bde1f12032479c529a9787d7b038ed55a0325398bd531aadf6')
+
+    depends_on('gsl')
+
+    @when('@2.02')
+    def patch(self):
+        filter_file(r'FFLAGS =  -O1 -g -ffixed-line-length-none     ' +
+                    r'-fno-range-check  \$\(DEF\)QUAD=0 \$\(DEF\)U77EXT=0',
+                    'FFLAGS =  -O1 -g -ffixed-line-length-none -std=legacy ' +
+                    '-fno-range-check  $(DEF)QUAD=0 $(DEF)U77EXT=0',
+                    'LoopTools-2.10/makefile-lxplus')
+        filter_file(r'-mkdir \$\(PREFIX\)', '-mkdir -p $(PREFIX)',
+                    'LoopTools-2.10/makefile-lxplus')
+        filter_file(r'-mkdir \$\(LIBDIR\) \$\(BINDIR\) \$\(INCLUDEDIR\)',
+                    '-mkdir -p $(LIBDIR) $(BINDIR) $(INCLUDEDIR)',
+                    'LoopTools-2.10/makefile-lxplus')
+
+    def install(self, spec, prefix):
+        mkdir(prefix.bin)
+        install('Hto4l', prefix.bin)