diff -urNp -x '*.orig' avogadro-1.2.0.org/CMakeLists.txt avogadro-1.2.0/CMakeLists.txt
--- avogadro-1.2.0.org/CMakeLists.txt	2016-06-08 16:19:45.000000000 +0200
+++ avogadro-1.2.0/CMakeLists.txt	2021-08-17 17:23:31.247260410 +0200
@@ -95,8 +95,6 @@ if (CMAKE_COMPILER_IS_GNUCXX)
   if(NOT APPLE) # Mac GCC42 compiler has bug
     check_cxx_compiler_flag(-fvisibility=hidden HAVE_GCC_VISIBILITY)
     set(HAVE_GCC_VISIBILITY ${HAVE_GCC_VISIBILITY} CACHE BOOL "GCC support for hidden visibility")
-    macro_ensure_version("4.1.0" "${_gcc_version}" GCC_IS_NEWER_THAN_4_1)
-    macro_ensure_version("4.2.0" "${_gcc_version}" GCC_IS_NEWER_THAN_4_2)
     set(_GCC_COMPILED_WITH_BAD_ALLOCATOR FALSE)
     if (GCC_IS_NEWER_THAN_4_1)
       exec_program(${CMAKE_C_COMPILER} ARGS -v OUTPUT_VARIABLE _gcc_alloc_info)
@@ -114,7 +112,7 @@ if (CMAKE_COMPILER_IS_GNUCXX)
   endif()
   # Set up additional build flags for particular build types. These will be added to CMAKE_CXX_FLAGS,
   # they will not replace them.
-  set(CMAKE_CXX_FLAGS_RELEASE "-O2 -DNDEBUG -DQT_NO_DEBUG_OUTPUT -Wl,-s")
+  set(CMAKE_CXX_FLAGS_RELEASE "-O2 -DNDEBUG -DQT_NO_DEBUG_OUTPUT")
   set(CMAKE_CXX_FLAGS_RELWITHDEBINFO
     "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} ${CMAKE_CXX_FLAGS_WARN}")
   set(CMAKE_CXX_FLAGS_DEBUG   "-g3 -fno-inline ${CMAKE_CXX_FLAGS_WARN}")
@@ -552,7 +550,7 @@ if(QT_MKSPECS_DIR AND INSTALL_QMAKE_PRF)
 #    )
     install(FILES
       "${CMAKE_CURRENT_BINARY_DIR}/avogadro.prf"
-      DESTINATION "${CMAKE_INSTALL_PREFIX}/${QT_MKSPECS_RELATIVE}/features"
+      DESTINATION "${QT_MKSPECS_DIR}/features"
     )
 #  endif ("${QT_MKSPECS_DIR}" MATCHES ^$"${CMAKE_INSTALL_PREFIX}/")
 else()
diff -urNp -x '*.orig' avogadro-1.2.0.org/libavogadro/src/extensions/symmetry/libmsym/CMakeLists.txt avogadro-1.2.0/libavogadro/src/extensions/symmetry/libmsym/CMakeLists.txt
--- avogadro-1.2.0.org/libavogadro/src/extensions/symmetry/libmsym/CMakeLists.txt	2016-06-08 16:19:45.000000000 +0200
+++ avogadro-1.2.0/libavogadro/src/extensions/symmetry/libmsym/CMakeLists.txt	2021-08-17 17:23:31.247260410 +0200
@@ -38,6 +38,7 @@ set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -st
 #        C_STANDARD_REQUIRED ON)
 
 set_target_properties(msym PROPERTIES PUBLIC_HEADER "src/msym.h;src/msym_error.h")
+target_link_libraries(msym m)
 
 export(TARGETS msym FILE "${PROJECT_BINARY_DIR}/libmsymTargets.cmake")