https://bugs.gentoo.org/823419

Wanted to make this "proper" but Catch2 lacks a pkgconfig file (or a CMake one)
and it's easier to just do this for now.

Based on patch version of sed commands from upstream bug
(https://github.com/puppetlabs/cpp-hocon/issues/132) and
Fedora (https://src.fedoraproject.org/rpms/cpp-hocon/blob/rawhide/f/cpp-hocon.spec#_76).

Makes tests conditional too.
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -16,12 +16,16 @@ if (NOT CMAKE_BUILD_TYPE)
     set(CMAKE_BUILD_TYPE "Release" CACHE STRING "Choose the type of build, options are: None Debug Release RelWithDebInfo MinSizeRel." FORCE)
 endif()
 
-enable_testing()
-
 # Leatherman setup
-set(LEATHERMAN_COMPONENTS locale catch nowide util)
+set(LEATHERMAN_COMPONENTS locale nowide util)
 find_package(Leatherman REQUIRED COMPONENTS ${LEATHERMAN_COMPONENTS})
 
+option(BUILD_TESTING "Build test suite (needs Catch)" ON)
+
+if(BUILD_TESTING)
+    enable_testing()
+endif()
+
 ## Before we find any packages, we want to pull in the common leatherman options, as they can affect commonly-used packages.
 include(options)
 ## Pull in common cflags setting from leatherman. Don't override CMAKE_CXX_FLAGS at the project root to avoid impacting 3rd party code.
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -91,4 +91,6 @@ symbol_exports(lib${PROJECT_NAME} "${CMAKE_CURRENT_LIST_DIR}/inc/hocon/export.h"
 leatherman_install(lib${PROJECT_NAME})
 install(DIRECTORY inc/hocon DESTINATION include)
 
-add_subdirectory(tests)
+if (BUILD_TESTING)
+    add_subdirectory(tests)
+endif()
--- a/lib/tests/CMakeLists.txt
+++ b/lib/tests/CMakeLists.txt
@@ -1,5 +1,5 @@
 # Setup compiling the test executable. C++ compile flags are inherited from the parent directory.
-include_directories(${LEATHERMAN_CATCH_INCLUDE})
+include_directories(@GENTOO_PORTAGE_EPREFIX@/usr/include/catch)
 
 set(TEST_CASES
     concatenation_test.cc