cmake: Extract version from configure.ac

CMakeLists.txt

 cmake_minimum_required(VERSION 3.15)
 
-project(libxslt1 VERSION 1.1.35 LANGUAGES C)
+file(STRINGS "configure.ac" CONFIGURE_AC_LINES)
+foreach(line ${CONFIGURE_AC_LINES})
+	if(line MATCHES [[^m4_define\(\[(MAJOR|MINOR|MICRO)_VERSION\],[ \t]*\[([0-9]+)\]\)$]])
+		set(LIBXSLT_${CMAKE_MATCH_1}_VERSION ${CMAKE_MATCH_2})
+        elseif(line MATCHES "^LIBEXSLT_(MAJOR|MINOR|MICRO)_VERSION=([0-9]+)$")
+		set(LIBEXSLT_${CMAKE_MATCH_1}_VERSION ${CMAKE_MATCH_2})
+	endif()
+endforeach()
+
+set(LIBXSLT_DOTTED_VERSION "${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(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(VERSION ${LIBXSLT_DOTTED_VERSION})
+set(LIBEXSLT_VERSION ${LIBEXSLT_DOTTED_VERSION})
+
+project(libxslt1 VERSION ${VERSION} LANGUAGES C)
 
 list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR})
 
@@ -55,25 +75,6 @@
 	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(CMAKE_C_COMPILER_ID MATCHES "Clang" OR CMAKE_C_COMPILER_ID STREQUAL "GNU")