diff --git a/CMakeLists.txt b/CMakeLists.txt
index a379da6..b0ea186 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,61 +1,56 @@
-cmake_minimum_required (VERSION 3.2)
+# Support version 3.2 and above, but use policy settings up to 3.14.
+cmake_minimum_required(VERSION 3.2...3.14)
+# Ranges are supported from 3.12, set policy to current for < 3.12.
+if(${CMAKE_VERSION} VERSION_LESS 3.12)
+  cmake_policy(VERSION ${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION})
+endif()
+
 project(gitea2rss
   VERSION 0.4.4
-  LANGUAGES CXX
-)
+  LANGUAGES CXX)
 
-set(WITH_MAN "YES" CACHE STRING "WITH_MAN defaults to \"YES\"")
-set(WITH_TESTS "NO" CACHE STRING "WITH_TESTS defaults to \"NO\"")
+# DESCRIPTION was introduced in version 3.9.
+if(NOT (${CMAKE_VERSION} VERSION_LESS 3.9))
+  set(PROJECT_DESCRIPTION
+    "Generates RSS feeds from Gitea releases or tags.")
+endif()
 
-include(GNUInstallDirs)
-find_package(PkgConfig REQUIRED)
-pkg_check_modules(CURLPP REQUIRED curlpp)
-pkg_check_modules(JSONCPP REQUIRED jsoncpp)
+option(WITH_MAN "Compile and install manpage." YES)
+option(WITH_TESTS "Compile tests." NO)
 
 set(CMAKE_CXX_STANDARD 14)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_CXX_EXTENSIONS OFF)
 
-set(CMAKE_CXX_FLAGS_DEBUG
-  "${CMAKE_CXX_FLAGS_DEBUG} -Wall -Wextra -Wpedantic -ftrapv \
--fsanitize=undefined -g -Og -fno-omit-frame-pointer")
+set(DEBUG_CXXFLAGS
+  "-Wall"
+  "-Wextra"
+  "-Wpedantic"
+  "-ftrapv"
+  "-fsanitize=undefined"
+  "-g"
+  "-Og"
+  "-fno-omit-frame-pointer")
+set(DEBUG_LDFLAGS
+  "-fsanitize=undefined")
+add_compile_options("$<$<CONFIG:Debug>:${DEBUG_CXXFLAGS}>")
+# add_link_options was introduced in version 3.13.
+if(${CMAKE_VERSION} VERSION_LESS 3.13)
+  set(CMAKE_SHARED_LINKER_FLAGS_DEBUG "${DEBUG_LDFLAGS}")
+else()
+  add_link_options("$<$<CONFIG:Debug>:${DEBUG_LDFLAGS}>")
+endif()
 
-include_directories(${PROJECT_SOURCE_DIR}/src)
-Include_directories(${PROJECT_BINARY_DIR})
+find_package(jsoncpp CONFIG REQUIRED)
+find_package(PkgConfig REQUIRED)
+pkg_check_modules(curlpp REQUIRED IMPORTED_TARGET curlpp)
 
-include_directories(${CURLPP_INCLUDE_DIRS})
-include_directories(${JSONCPP_INCLUDE_DIRS})
-
-link_directories(${CURLPP_LIBRARY_DIRS})
-link_directories(${JSONCPP_LIBRARY_DIRS})
-
-# Write version in header
-configure_file(
-    "${PROJECT_SOURCE_DIR}/src/version.hpp.in"
-    "${PROJECT_BINARY_DIR}/version.hpp"
-)
-
-file(GLOB sources src/*.cpp)
-add_executable(${PROJECT_NAME} "${sources}")
-target_link_libraries(${PROJECT_NAME} ${CURLPP_LIBRARIES} ${JSONCPP_LIBRARIES})
-install(TARGETS ${PROJECT_NAME} DESTINATION ${CMAKE_INSTALL_BINDIR})
+add_subdirectory(src)
 
 if (WITH_MAN)
-  add_custom_command(
-    OUTPUT "${PROJECT_BINARY_DIR}/${PROJECT_NAME}.1"
-    WORKING_DIRECTORY "${PROJECT_BINARY_DIR}"
-    DEPENDS "${CMAKE_SOURCE_DIR}/${PROJECT_NAME}.1.adoc"
-    COMMAND ${CMAKE_SOURCE_DIR}/build_manpage.sh
-    ARGS ${PROJECT_VERSION})
-  add_custom_target(run ALL DEPENDS "${PROJECT_BINARY_DIR}/${PROJECT_NAME}.1")
-  install(
-    FILES ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}.1
-    DESTINATION ${CMAKE_INSTALL_MANDIR}/man1)
+  add_subdirectory(man)
 endif()
 
 if(WITH_TESTS)
-  add_library(${PROJECT_NAME}_testlib SHARED ${sources})
-  target_link_libraries(${PROJECT_NAME}_testlib
-    ${CURLPP_LIBRARIES} ${JSONCPP_LIBRARIES})
-  include(tests.CMakeLists.txt)
+  add_subdirectory(tests)
 endif()
diff --git a/config/nginx-example.conf b/config/nginx-example.conf
index 7cb5916..4a8c6ee 100644
--- a/config/nginx-example.conf
+++ b/config/nginx-example.conf
@@ -11,6 +11,7 @@ server {
     ssl_certificate /var/lib/dehydrated/certs/rss.example.com/fullchain.pem;
     ssl_certificate_key /var/lib/dehydrated/certs/rss.example.com/privkey.pem;
 
+    # Tell clients to cache for 1 hour.
     expires 1h;
 
     location / {
diff --git a/man/CMakeLists.txt b/man/CMakeLists.txt
new file mode 100644
index 0000000..9fb0b7b
--- /dev/null
+++ b/man/CMakeLists.txt
@@ -0,0 +1,14 @@
+include(GNUInstallDirs)
+
+add_custom_command(
+  OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}.1"
+  WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}"
+  DEPENDS "${PROJECT_NAME}.1.adoc"
+  COMMAND "${PROJECT_SOURCE_DIR}/man/build_manpage.sh"
+  ARGS "${PROJECT_VERSION}")
+
+add_custom_target(man ALL
+  DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}.1")
+
+install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}.1
+  DESTINATION ${CMAKE_INSTALL_MANDIR}/man1)
diff --git a/build_manpage.sh b/man/build_manpage.sh
similarity index 92%
rename from build_manpage.sh
rename to man/build_manpage.sh
index 72b8ce4..1f87940 100755
--- a/build_manpage.sh
+++ b/man/build_manpage.sh
@@ -3,7 +3,7 @@
 name="gitea2rss"
 
 if [ -n "${1}" ]; then
-    dir="$(dirname ${0})"
+    dir=$(dirname "${0}")
     version=${1}
     cp -vf "${dir}/${name}.1.adoc" .
     sed -Ei "s/(Revision: +)[0-9]+\.[0-9]\.[0-9]/\1${version}/" "${name}.1.adoc"
diff --git a/gitea2rss.1.adoc b/man/gitea2rss.1.adoc
similarity index 100%
rename from gitea2rss.1.adoc
rename to man/gitea2rss.1.adoc
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
new file mode 100644
index 0000000..9a142fa
--- /dev/null
+++ b/src/CMakeLists.txt
@@ -0,0 +1,16 @@
+include(GNUInstallDirs)
+
+# Write version in header
+configure_file("version.hpp.in"
+  "${CMAKE_CURRENT_BINARY_DIR}/version.hpp")
+
+file(GLOB sources *.cpp)
+add_executable(${PROJECT_NAME} "${sources}" "gitea2rss.hpp")
+
+target_include_directories(${PROJECT_NAME}
+  PRIVATE "$<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}>")
+
+target_link_libraries(${PROJECT_NAME}
+  PRIVATE PkgConfig::curlpp jsoncpp_lib)
+
+install(TARGETS ${PROJECT_NAME} DESTINATION ${CMAKE_INSTALL_BINDIR})
diff --git a/tests.CMakeLists.txt b/tests.CMakeLists.txt
deleted file mode 100644
index 164eb2d..0000000
--- a/tests.CMakeLists.txt
+++ /dev/null
@@ -1,24 +0,0 @@
-include(CTest)
-file(GLOB sources_tests tests/test_*.cpp)
-
-find_package(Catch2)
-if(Catch2_FOUND)    # Catch 2.x
-  include(Catch)
-  add_executable(all_tests tests/main.cpp ${sources_tests})
-  target_link_libraries(all_tests Catch2::Catch2 ${PROJECT_NAME}_testlib)
-  target_include_directories(all_tests PRIVATE "/usr/include/catch2")
-  catch_discover_tests(all_tests EXTRA_ARGS "${EXTRA_TEST_ARGS}")
-else()              # Catch 1.x
-  if(EXISTS "/usr/include/catch.hpp")
-    message(STATUS "Catch 1.x found.")
-    foreach(src ${sources_tests})
-      get_filename_component(bin ${src} NAME_WE)
-      add_executable(${bin} tests/main.cpp ${src})
-      target_link_libraries(${bin} ${PROJECT_NAME}_testlib)
-      add_test(${bin} ${bin} "${EXTRA_TEST_ARGS}")
-    endforeach()
-  else()
-    message(FATAL_ERROR
-      "Neither Catch 2.x nor Catch 1.x could be found.")
-  endif()
-endif()
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
new file mode 100644
index 0000000..2b8737d
--- /dev/null
+++ b/tests/CMakeLists.txt
@@ -0,0 +1,38 @@
+include(CTest)
+
+file(GLOB sources_testlib ../src/*.cpp)
+add_library(${PROJECT_NAME}_testlib SHARED ${sources_testlib})
+
+target_include_directories(${PROJECT_NAME}_testlib
+  PUBLIC
+  "$<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/src>"
+  "$<BUILD_INTERFACE:${PROJECT_BINARY_DIR}/src>")
+
+target_link_libraries(${PROJECT_NAME}_testlib
+  PRIVATE PkgConfig::curlpp jsoncpp_lib)
+
+file(GLOB sources_tests test_*.cpp)
+
+find_package(Catch2 CONFIG)
+if(Catch2_FOUND)                # Catch 2.x
+  include(Catch)
+  add_executable(all_tests main.cpp ${sources_tests})
+  target_link_libraries(all_tests
+    PRIVATE Catch2::Catch2 ${PROJECT_NAME}_testlib)
+  target_include_directories(all_tests PRIVATE "/usr/include/catch2")
+  catch_discover_tests(all_tests EXTRA_ARGS "${EXTRA_TEST_ARGS}")
+else()                          # Catch 1.x
+  if(EXISTS "/usr/include/catch.hpp")
+    message(STATUS "Catch 1.x found.")
+    foreach(src ${sources_tests})
+      get_filename_component(bin ${src} NAME_WE)
+      add_executable(${bin} main.cpp ${src})
+      target_link_libraries(${bin}
+        PRIVATE ${PROJECT_NAME}_testlib)
+      add_test(${bin} ${bin} "${EXTRA_TEST_ARGS}")
+    endforeach()
+  else()
+    message(FATAL_ERROR
+      "Neither Catch 2.x nor Catch 1.x could be found.")
+  endif()
+endif()