[build] Make building documentation configurable

CMakeLists.txt

@@ -2,6 +2,7 @@ cmake_minimum_required(VERSION 3.10)
 
 project(NGS)
 
+option(BUILD_MAN "Build documentation" ON)
 option(INSTALL_EXAMPLE_SCRIPTS "Install example scripts" OFF)
 
 include(CheckFunctionExists)
@@ -125,7 +126,14 @@ add_custom_command(
 
 target_link_libraries(ngs m Threads::Threads ${CMAKE_DL_LIBS} ${LIBGC_LIBRARIES} ${LIBFFI_LIBRARIES} ${JSONC_LIBRARIES} ${PCRE_LIBRARIES} ${Backtrace_LIBRARY})
 
-add_custom_target(man ALL WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/doc COMMAND make man DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/doc/*.1.md)
+if(BUILD_MAN)
+	add_custom_target(man ALL WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/doc COMMAND make man DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/doc/*.1.md)
+	find_program(PANDOC pandoc)
+	if(NOT PANDOC)
+	  message(FATAL_ERROR "Could not find pandoc")
+	endif()
+	install(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/doc/ DESTINATION ${CMAKE_INSTALL_MANDIR}/man1 FILES_MATCHING PATTERN "*.1")
+endif()
 
 
 install(FILES "${PROJECT_BINARY_DIR}/ngs" DESTINATION ${CMAKE_INSTALL_BINDIR})
@@ -140,7 +148,6 @@ if(INSTALL_EXAMPLE_SCRIPTS)
 	)
 endif()
 install(FILES ${CMAKE_CURRENT_SOURCE_DIR}/LICENSE DESTINATION ${CMAKE_INSTALL_DOCDIR})
-install(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/doc/ DESTINATION ${CMAKE_INSTALL_MANDIR}/man1 FILES_MATCHING PATTERN "*.1")
 
 enable_testing()
 add_test(all bash -c "${CMAKE_CURRENT_BINARY_DIR}/ngs ${CMAKE_CURRENT_SOURCE_DIR}/test.ngs")