diff -Nru mcl-14-137+ds/debian/changelog mcl-14-137+ds/debian/changelog
--- mcl-14-137+ds/debian/changelog	2020-06-29 09:54:16.000000000 +0000
+++ mcl-14-137+ds/debian/changelog	2020-07-22 13:32:45.000000000 +0000
@@ -1,3 +1,9 @@
+mcl (1:14-137+ds-9) unstable; urgency=medium
+
+  * Fix FTBFS when using gcc-10 (Closes: #957525)
+
+ -- Shayan Doust <hello@shayandoust.me>  Wed, 22 Jul 2020 14:32:45 +0100
+
 mcl (1:14-137+ds-8) unstable; urgency=medium
 
   * Add myself as an uploader
diff -Nru mcl-14-137+ds/debian/patches/02-wrong-interpreter-path.patch mcl-14-137+ds/debian/patches/02-wrong-interpreter-path.patch
--- mcl-14-137+ds/debian/patches/02-wrong-interpreter-path.patch	2020-06-29 09:54:16.000000000 +0000
+++ mcl-14-137+ds/debian/patches/02-wrong-interpreter-path.patch	2020-07-22 13:32:45.000000000 +0000
@@ -1,6 +1,6 @@
+Description: wrong interpreter path
+ Purpose: Fix wrong path of perl interpreter
 Author: Philipp Benner <philipp@debian.org>
-Purpose: Fix wrong path of perl interpreter
-
 --- a/src/alien/oxygen/src/mcxdeblast
 +++ b/src/alien/oxygen/src/mcxdeblast
 @@ -1,4 +1,4 @@
diff -Nru mcl-14-137+ds/debian/patches/gcc-10-port.patch mcl-14-137+ds/debian/patches/gcc-10-port.patch
--- mcl-14-137+ds/debian/patches/gcc-10-port.patch	1970-01-01 00:00:00.000000000 +0000
+++ mcl-14-137+ds/debian/patches/gcc-10-port.patch	2020-07-22 13:32:45.000000000 +0000
@@ -0,0 +1,37 @@
+Description: fixes FTBFS on gcc-10
+ A major change to gcc-10 migration is its default to -f-no-common. Instead of overriding and using 
+ the old behaviour (by using -fcommon), this patch uses the preferred method of fixing some 
+ declarations in the header files via the use of extern.
+Bug-Debian: https://bugs.debian.org/957525
+Author: Shayan Doust <hello@shayandoust.me> 
+Last-Update: 2020-07-22
+---
+
+Index: mcl/src/impala/iface.h
+===================================================================
+--- mcl.orig/src/impala/iface.h
++++ mcl/src/impala/iface.h
+@@ -16,15 +16,15 @@
+ 
+ /* This file currently provides nothing */
+ 
+-dim nu_meet_can  ;
+-dim nu_meet_sl   ;
+-dim nu_meet_zip  ;
+-dim nu_diff_can  ;
+-dim nu_diff_sl   ;
+-dim nu_diff_zip  ;
+-double nu_magic  ;
++extern dim nu_meet_can  ;
++extern dim nu_meet_sl   ;
++extern dim nu_meet_zip  ;
++extern dim nu_diff_can  ;
++extern dim nu_diff_sl   ;
++extern dim nu_diff_zip  ;
++extern double nu_magic  ;
+ 
+-dim mclx_n_thread_g  ;
++extern dim mclx_n_thread_g  ;
+ 
+ #endif
+ 
diff -Nru mcl-14-137+ds/debian/patches/series mcl-14-137+ds/debian/patches/series
--- mcl-14-137+ds/debian/patches/series	2020-06-29 09:54:16.000000000 +0000
+++ mcl-14-137+ds/debian/patches/series	2020-07-22 13:32:45.000000000 +0000
@@ -1,3 +1,4 @@
+gcc-10-port.patch
 OCamlSupport.patch
 # 01-restrict-variables.patch
 02-wrong-interpreter-path.patch