Add CMake build

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.26)
+
+project(rolldice
+  VERSION 1.16
+  LANGUAGES C
+  DESCRIPTION "rolls virtual dice")
+
+add_executable(rolldice rolldice.c main.c)
+target_include_directories(rolldice PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
+target_link_libraries(rolldice PUBLIC readline)
+
+# man page with sed
+add_custom_command(
+  OUTPUT rolldice.6.gz
+  COMMAND sed s/__VERSION__/${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}/ ${CMAKE_CURRENT_SOURCE_DIR}/rolldice.6.src > rolldice.6
+  COMMAND gzip -n -9 -c ${CMAKE_CURRENT_BINARY_DIR}/rolldice.6 > rolldice.6.gz
+  COMMENT "Running sed to generate man page"
+  VERBATIM
+)
+add_custom_target(generate_man ALL
+  DEPENDS rolldice.6.gz)
+
+include(GNUInstallDirs)
+set(CMAKE_INSTALL_GAMEDIR "${CMAKE_INSTALL_PREFIX}/games"
+  CACHE PATH "Installation directory for games" FORCE)
+install(TARGETS rolldice
+  RUNTIME DESTINATION ${CMAKE_INSTALL_GAMEDIR})
+install(FILES ${CMAKE_CURRENT_BINARY_DIR}/rolldice.6.gz
+  DESTINATION ${CMAKE_INSTALL_MANDIR}/man6)
+
+# CPack options
+set(CPACK_PACKAGE_VENDOR "Stevie Strickland")
+set(CPACK_PACKAGE_CONTACT "sstrickl@gmail.com")
+set(CPACK_PACKAGE_HOMEPAGE_URL "https://github.com/sstrickl/rolldice")
+set(CPACK_PACKAGE_DESCRIPTION_FILE "${CMAKE_CURRENT_SOURCE_DIR}/DESCRIPTION")
+
+set(CPACK_RPM_PACKAGE_LICENSE "GPL-2.0-only")
+set(CPACK_RPM_PACKAGE_REQUIRES "readline")
+
+set(CPACK_DEBIAN_PACKAGE_DEPENDS "libreadline8 | libreadline7")
+include(CPack)

DESCRIPTION

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+rolls virtual dice.
+
+The dice strings passed on the command line contain information on the dice to roll in a format comparable to the format used in
+most role playing games.