diff --git a/math/cado-nfs/files/patch-CMakeLists.txt b/math/cado-nfs/files/patch-CMakeLists.txt
new file mode 100644
index 000000000000..674ac4812f6a
--- /dev/null
+++ b/math/cado-nfs/files/patch-CMakeLists.txt
@@ -0,0 +1,51 @@
+- workaround for the failure: error: variable 'total_weight' set but not used [-Werror,-Wunused-but-set-variable]
+
+--- CMakeLists.txt.orig	2022-01-31 23:16:04 UTC
++++ CMakeLists.txt
+@@ -146,7 +146,7 @@ if(CMAKE_COMPILER_IS_GNUCC)
+     # prevents the definition of __STRICT_ANSI__
+     #
+     # Ditto for C++, with the c++98/gnu++98 subtlety.
+-    set (CMAKE_C_FLAGS "-W -Wall ${CMAKE_C_FLAGS}")
++    set (CMAKE_C_FLAGS "-W ${CMAKE_C_FLAGS}")
+     if (MINGW)
+         set (CMAKE_C_FLAGS "-std=gnu99 ${CMAKE_C_FLAGS}")
+     else()
+@@ -156,7 +156,7 @@ if(CMAKE_COMPILER_IS_GNUCC)
+ endif()
+ 
+ if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
+-    set (CMAKE_CXX_FLAGS "-W -Wall ${CMAKE_CXX_FLAGS}")
++    set (CMAKE_CXX_FLAGS "-W ${CMAKE_CXX_FLAGS}")
+     if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5.0)
+         message(FATAL_ERROR "cado-nfs requires gcc version 5 or greater")
+     endif()
+@@ -187,8 +187,8 @@ endif()
+ 
+ if(CMAKE_C_COMPILER_ID MATCHES "Intel")
+     message(STATUS "Applying flags for icc")
+-    set (CMAKE_C_FLAGS   "-W -Wall -wd13200,13203 ${CMAKE_C_FLAGS}")
+-    set (CMAKE_CXX_FLAGS "-W -Wall -wd13200,13203,3058 ${CMAKE_CXX_FLAGS}")
++    set (CMAKE_C_FLAGS   "-W -wd13200,13203 ${CMAKE_C_FLAGS}")
++    set (CMAKE_CXX_FLAGS "-W -wd13200,13203,3058 ${CMAKE_CXX_FLAGS}")
+     set (CMAKE_C_FLAGS   "-std=c99 ${CMAKE_C_FLAGS}")
+ 
+     # only icc>=15 is full c++11 compliant, it seems. But 14 will do.
+@@ -206,7 +206,7 @@ endif()
+ 
+ if(CMAKE_C_COMPILER_ID MATCHES "AppleClang" OR CMAKE_HOST_SYSTEM_NAME
+         STREQUAL "Darwin" AND CMAKE_C_COMPILER_ID MATCHES "Clang" )
+-    set (CMAKE_C_FLAGS   "-std=c99 -W -Wall ${CMAKE_C_FLAGS}")
++    set (CMAKE_C_FLAGS   "-std=c99 -W ${CMAKE_C_FLAGS}")
+ endif()
+ 
+ if(CMAKE_CXX_COMPILER_ID MATCHES "AppleClang" OR CMAKE_HOST_SYSTEM_NAME
+@@ -226,7 +226,7 @@ elseif(CMAKE_CXX_COMPILER_ID MATCHES "^Clang")
+         set (CMAKE_CXX_FLAGS   "-std=c++11 ${CMAKE_CXX_FLAGS}")
+         set (HAVE_CXX11 1)
+         message(STATUS "Enabling C++11 support")
+-        set (CMAKE_CXX_FLAGS "-std=c++11 -W -Wall ${CMAKE_CXX_FLAGS}")
++        set (CMAKE_CXX_FLAGS "-std=c++11 -W ${CMAKE_CXX_FLAGS}")
+     endif()
+ endif()
+ message(STATUS "CFLAGS=${CMAKE_C_FLAGS} (synthetized)")