Borrowed from Debian
https://sources.debian.org/src/gnupg1/1.4.23-1.1/debian/patches/0006-fix-for-gcc10.patch/

Subject: Fix build with gcc-10
Author: Christoph Biedl <debian.axhn@manchmal.in-ulm.de>
Date: 2021-01-04
Bug: https://dev.gnupg.org/T5215
Bug-Debian: https://bugs.debian.org/957293

--- a/g10/options.h
+++ b/g10/options.h
@@ -29,6 +29,8 @@
 /* Norcraft can't cope with common symbols */
 #if defined (__riscos__) && !defined (INCLUDED_BY_MAIN_MODULE)
 #define EXTERN_UNLESS_MAIN_MODULE extern
+#elif defined (__GNUC__) && __GNUC__ >= 10
+#define EXTERN_UNLESS_MAIN_MODULE __attribute__((__common__))
 #else
 #define EXTERN_UNLESS_MAIN_MODULE
 #endif
--- a/include/cipher.h
+++ b/include/cipher.h
@@ -117,6 +117,8 @@
 #ifndef EXTERN_UNLESS_MAIN_MODULE
 #if defined (__riscos__) && !defined (INCLUDED_BY_MAIN_MODULE)
 #define EXTERN_UNLESS_MAIN_MODULE extern
+#elif defined (__GNUC__) && __GNUC__ >= 10
+#define EXTERN_UNLESS_MAIN_MODULE __attribute__((__common__))
 #else
 #define EXTERN_UNLESS_MAIN_MODULE
 #endif
--- a/include/iobuf.h
+++ b/include/iobuf.h
@@ -72,6 +72,8 @@
 #ifndef EXTERN_UNLESS_MAIN_MODULE
 #if defined (__riscos__) && !defined (INCLUDED_BY_MAIN_MODULE)
 #define EXTERN_UNLESS_MAIN_MODULE extern
+#elif defined (__GNUC__) && __GNUC__ >= 10
+#define EXTERN_UNLESS_MAIN_MODULE __attribute__((__common__))
 #else
 #define EXTERN_UNLESS_MAIN_MODULE 
 #endif
--- a/include/memory.h
+++ b/include/memory.h
@@ -93,6 +93,8 @@
 #ifndef EXTERN_UNLESS_MAIN_MODULE
 #if defined (__riscos__) && !defined (INCLUDED_BY_MAIN_MODULE)
 #define EXTERN_UNLESS_MAIN_MODULE extern
+#elif defined (__GNUC__) && __GNUC__ >= 10
+#define EXTERN_UNLESS_MAIN_MODULE __attribute__((__common__))
 #else
 #define EXTERN_UNLESS_MAIN_MODULE 
 #endif
--- a/include/mpi.h
+++ b/include/mpi.h
@@ -38,6 +38,8 @@
 #ifndef EXTERN_UNLESS_MAIN_MODULE
 #if defined (__riscos__) && !defined (INCLUDED_BY_MAIN_MODULE)
 #define EXTERN_UNLESS_MAIN_MODULE extern
+#elif defined (__GNUC__) && __GNUC__ >= 10
+#define EXTERN_UNLESS_MAIN_MODULE __attribute__((__common__))
 #else
 #define EXTERN_UNLESS_MAIN_MODULE 
 #endif
og/gnu?id=0cbc175c8bd3aecd837f1b0cd266e0deab177f40'>gnu</a>/<a href='/guix/log/gnu/packages?id=0cbc175c8bd3aecd837f1b0cd266e0deab177f40'>packages</a>/<a href='/guix/log/gnu/packages/w3m.scm?id=0cbc175c8bd3aecd837f1b0cd266e0deab177f40'>w3m.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/packages/w3m.scm?id=0cbc175c8bd3aecd837f1b0cd266e0deab177f40&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>