Use CMake PROJECT_VERSION

CMakeLists.txt

 cmake_minimum_required(VERSION 3.15)
 
-project(libxslt1 C)
+project(libxslt1 VERSION 1.1.34 LANGUAGES C)
 
 list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR})
 
@@ -12,25 +12,6 @@
 include(CMakePackageConfigHelpers)
 include(GNUInstallDirs)
 
-set(LIBEXSLT_MAJOR_VERSION 0)
-set(LIBEXSLT_MINOR_VERSION 8)
-set(LIBEXSLT_MICRO_VERSION 20)
-
-set(LIBEXSLT_DOTTED_VERSION ${LIBEXSLT_MAJOR_VERSION}.${LIBEXSLT_MINOR_VERSION}.${LIBEXSLT_MICRO_VERSION})
-math(EXPR LIBEXSLT_VERSION_NUMBER "${LIBEXSLT_MAJOR_VERSION} * 10000 + ${LIBEXSLT_MINOR_VERSION} * 100 + ${LIBEXSLT_MICRO_VERSION}")
-set(LIBEXSLT_VERSION_EXTRA "")
-
-set(LIBXSLT_MAJOR_VERSION 1)
-set(LIBXSLT_MINOR_VERSION 1)
-set(LIBXSLT_MICRO_VERSION 34)
-
-set(LIBXSLT_DOTTED_VERSION "${LIBXSLT_MAJOR_VERSION}.${LIBXSLT_MINOR_VERSION}.${LIBXSLT_MICRO_VERSION}")
-math(EXPR LIBXSLT_VERSION_NUMBER "${LIBXSLT_MAJOR_VERSION} * 10000 + ${LIBXSLT_MINOR_VERSION} * 100 + ${LIBXSLT_MICRO_VERSION}")
-set(LIBXSLT_VERSION_EXTRA "")
-
-set(VERSION ${LIBXSLT_DOTTED_VERSION})
-set(LIBEXSLT_VERSION ${LIBEXSLT_DOTTED_VERSION})
-
 find_package(LibXml2 CONFIG REQUIRED)
 
 option(BUILD_SHARED_LIBS "Build shared libraries" ON)
@@ -75,6 +56,25 @@
 	endif()
 endforeach()
 
+set(LIBEXSLT_MAJOR_VERSION 0)
+set(LIBEXSLT_MINOR_VERSION 8)
+set(LIBEXSLT_MICRO_VERSION 20)
+
+set(LIBEXSLT_DOTTED_VERSION ${LIBEXSLT_MAJOR_VERSION}.${LIBEXSLT_MINOR_VERSION}.${LIBEXSLT_MICRO_VERSION})
+math(EXPR LIBEXSLT_VERSION_NUMBER "${LIBEXSLT_MAJOR_VERSION} * 10000 + ${LIBEXSLT_MINOR_VERSION} * 100 + ${LIBEXSLT_MICRO_VERSION}")
+set(LIBEXSLT_VERSION_EXTRA "")
+
+set(LIBXSLT_MAJOR_VERSION ${PROJECT_VERSION_MAJOR})
+set(LIBXSLT_MINOR_VERSION ${PROJECT_VERSION_MINOR})
+set(LIBXSLT_MICRO_VERSION ${PROJECT_VERSION_PATCH})
+
+set(LIBXSLT_DOTTED_VERSION "${LIBXSLT_MAJOR_VERSION}.${LIBXSLT_MINOR_VERSION}.${LIBXSLT_MICRO_VERSION}")
+math(EXPR LIBXSLT_VERSION_NUMBER "${LIBXSLT_MAJOR_VERSION} * 10000 + ${LIBXSLT_MINOR_VERSION} * 100 + ${LIBXSLT_MICRO_VERSION}")
+set(LIBXSLT_VERSION_EXTRA "")
+
+set(VERSION ${LIBXSLT_DOTTED_VERSION})
+set(LIBEXSLT_VERSION ${LIBEXSLT_DOTTED_VERSION})
+
 set(MODULE_EXTENSION "${CMAKE_SHARED_LIBRARY_SUFFIX}")
 
 if(LIBXSLT_WITH_CRYPTO)
@@ -240,7 +240,7 @@
 	OUTPUT_NAME xslt
 	POSITION_INDEPENDENT_CODE ON
 	PREFIX lib
-	VERSION ${VERSION}
+	VERSION ${PROJECT_VERSION}
 )
 
 if(WIN32)
@@ -410,7 +410,7 @@
 		IMPORT_PREFIX lib
 		OUTPUT_NAME xsltmod
 		PREFIX lib
-		VERSION ${VERSION}
+		VERSION ${PROJECT_VERSION}
 	)
 	install(
 		TARGETS	LibXsltMod
@@ -430,8 +430,8 @@
 install(DIRECTORY doc/ DESTINATION ${CMAKE_INSTALL_DATADIR}/doc/libxslt COMPONENT documentation PATTERN Makefile.* EXCLUDE)
 
 if(LIBXSLT_WITH_CRYPTO)
-	install(FILES FindGcrypt.cmake DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/libxslt-${VERSION} COMPONENT development)
+	install(FILES FindGcrypt.cmake DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/libxslt-${PROJECT_VERSION} COMPONENT development)
 endif()
 
 configure_package_config_file(
 	libxslt-config.cmake.cmake.in libxslt-config.cmake
@@ -434,9 +434,9 @@
 endif()
 
 configure_package_config_file(
 	libxslt-config.cmake.cmake.in libxslt-config.cmake
-	INSTALL_DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/libxslt-${VERSION}
+	INSTALL_DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/libxslt-${PROJECT_VERSION}
 )
 
 install(
 	FILES ${CMAKE_CURRENT_BINARY_DIR}/libxslt-config.cmake
@@ -439,10 +439,10 @@
 )
 
 install(
 	FILES ${CMAKE_CURRENT_BINARY_DIR}/libxslt-config.cmake
-	DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/libxslt-${VERSION}
+	DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/libxslt-${PROJECT_VERSION}
 	COMPONENT development
 )
 
 write_basic_package_version_file(
 	${CMAKE_CURRENT_BINARY_DIR}/libxslt-config-version.cmake
@@ -444,11 +444,11 @@
 	COMPONENT development
 )
 
 write_basic_package_version_file(
 	${CMAKE_CURRENT_BINARY_DIR}/libxslt-config-version.cmake
-	VERSION ${VERSION}
+	VERSION ${PROJECT_VERSION}
 	COMPATIBILITY ExactVersion
 )
 
 install(
 	FILES ${CMAKE_CURRENT_BINARY_DIR}/libxslt-config-version.cmake
@@ -450,11 +450,11 @@
 	COMPATIBILITY ExactVersion
 )
 
 install(
 	FILES ${CMAKE_CURRENT_BINARY_DIR}/libxslt-config-version.cmake
-	DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/libxslt-${VERSION}
+	DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/libxslt-${PROJECT_VERSION}
 	COMPONENT development
 )
 
 install(
 	EXPORT LibXslt
@@ -456,9 +456,9 @@
 	COMPONENT development
 )
 
 install(
 	EXPORT LibXslt
-	DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/libxslt-${VERSION}
+	DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/libxslt-${PROJECT_VERSION}
 	NAMESPACE LibXslt::
 	FILE libxslt-export.cmake
 	COMPONENT development