diff --git a/CHANGES b/CHANGES
index 3e29e24..b65cdc2 100644
--- a/CHANGES
+++ b/CHANGES
@@ -12,6 +12,14 @@ Corrections:
 	quotes
 	Test: UNBALANCED_QUOTE
 
+Porting:
+	In gcc version 10 the default changed from -fcommon to -fno-common.
+	Consequently, linking filan and procan failed with error
+	"multiple definition of `deny_severity'" and `allow_severity'
+	Fixed by removing definitions in filan.c and procan.c
+	Debian issue 957823
+	Thanks to László Böszörményi and others for reporting this issue.
+
 Testing:
 	test.sh now produces a list of tests that could not be performed for
 	any reason. This helps to analyse these cases.
diff --git a/filan.c b/filan.c
index 563bee9..c613059 100644
--- a/filan.c
+++ b/filan.c
@@ -28,10 +28,6 @@ struct sockopt {
 
 static int filan_streams_analyze(int fd, FILE *outfile);
 
-/* dirty workaround so we dont get an error on AIX when being linked with
-   libwrap */
-int allow_severity, deny_severity;
-
 /* global variables for configuring filan */
 bool filan_followsymlinks;
 bool filan_rawoutput;
diff --git a/procan.c b/procan.c
index 9ebd423..d0d92f3 100644
--- a/procan.c
+++ b/procan.c
@@ -19,10 +19,6 @@
 
 #include "procan.h"
 
-/* dirty workaround so we dont get an error on AIX when getting linked with
-   libwrap */
-int allow_severity, deny_severity;
-
 
 int procan(FILE *outfile) {