diff --git a/extra/gnupg1/build b/extra/gnupg1/build
index 2f29dbb8..55670c2f 100755
--- a/extra/gnupg1/build
+++ b/extra/gnupg1/build
@@ -1,5 +1,8 @@
 #!/bin/sh -e
 
+# Fix build fail with GCC 10.
+export CFLAGS="$CFLAGS -fcommon"
+
 ./configure \
     --prefix=/usr \
     --sysconfdir=/etc \