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diff --git a/cmake/Modules/FindHepMC.cmake b/cmake/Modules/FindHepMC.cmake
index dc207fe..8cb7edf 100644
--- a/cmake/Modules/FindHepMC.cmake
+++ b/cmake/Modules/FindHepMC.cmake
@@ -1,107 +1,107 @@
#.rst:
# FindHepMC
# -------
#
# Finds the HepMC library.
#
# This will define the following variables::
#
# HepMC_FOUND - True if the system has the HepMC library
# HepMC_VERSION - The version of the HepMC library which was found
# HepMC_VERSION_MAJOR - Major version (first number in version string)
# HepMC_VERSION_MINOR - Minor version (second number in version string)
# HepMC_VERSION_PATCH - Patch version (third number in version string)
#
# and the following imported targets::
#
# HepMC::HepMC - The HepMC library
#
# To provide a hint for the preferred HepMC installation, set
# ``HepMC_ROOT`` to the directory containing said installation.
#
#=============================================================================
# Copyright 2016 Andreas Maier (andreas.maier@durham.ac.uk)
#
# Distributed under the OSI-approved BSD License (the "License");
# see accompanying file Copyright.txt for details.
#
# This software is distributed WITHOUT ANY WARRANTY; without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the License for more information.
#=============================================================================
# (To distribute this file outside of CMake, substitute the full
# License text for the above reference.)
find_package(PkgConfig)
pkg_check_modules(PC_HepMC QUIET HepMC)
unset(HepMC_INCLUDE_DIR)
find_path(HepMC_INCLUDE_DIR
NAMES HepMCDefs.h
PATHS ${HepMC_ROOT} ${PC_HepMC_INCLUDE_DIRS}
PATH_SUFFIXES HepMC
)
find_library(HepMC_LIBRARY
NAMES HepMC
PATHS ${HepMC_ROOT} ${PC_HepMC_LIBRARY_DIRS}
)
-if(IS_DIRECTORY HepMC_INCLUDE_DIR)
+if(IS_DIRECTORY ${HepMC_INCLUDE_DIR})
file(STRINGS "${HepMC_INCLUDE_DIR}/HepMCDefs.h" _HepMC_DEFS)
file(STRINGS "${HepMC_INCLUDE_DIR}/Version.h" _HepMC_VERS)
string(
REGEX MATCH
"#define *HEPMC_VERSION *\"[^\"]*\""
_HepMC_VERSION_STR "${_HepMC_DEFS} ${_HepMC_VERS}"
)
string(
REGEX MATCH
"[0-9]*\\.[0-9]*\\.[0-9]*"
HepMC_VERSION ${_HepMC_VERSION_STR}
)
string(
REGEX MATCH
"^[0-9]*"
HepMC_VERSION_MAJOR ${HepMC_VERSION}
)
string(
REGEX REPLACE
"^[0-9]*\\.([0-9]*)" "\\1"
HepMC_VERSION_MINOR ${HepMC_VERSION}
)
string(
REGEX MATCH
"[0-9]*$"
HepMC_VERSION_PATCH ${HepMC_VERSION}
)
message(STATUS "HepMC version: ${HepMC_VERSION}")
endif()
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(HepMC
FOUND_VAR HepMC_FOUND
REQUIRED_VARS
HepMC_LIBRARY
HepMC_INCLUDE_DIR
VERSION_VAR HepMC_VERSION
)
if(HepMC_FOUND)
set(HepMC_LIBRARIES ${HepMC_LIBRARY})
set(HepMC_INCLUDE_DIRS ${HepMC_INCLUDE_DIR})
set(HepMC_DEFINITIONS ${PC_HepMC_CFLAGS_OTHER})
endif()
if(HepMC_FOUND AND NOT TARGET HepMC::HepMC)
add_library(HepMC::HepMC UNKNOWN IMPORTED)
set_target_properties(HepMC::HepMC PROPERTIES
IMPORTED_LOCATION "${HepMC_LIBRARY}"
INTERFACE_COMPILE_OPTIONS "${PC_HepMC_CFLAGS_OTHER}"
INTERFACE_INCLUDE_DIRECTORIES "${HepMC_INCLUDE_DIR}"
)
endif()
mark_as_advanced(
HepMC_INCLUDE_DIR
HepMC_LIBRARY
)

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