https://bugs.gentoo.org/707156
--- a/src/ip6_bit.c
+++ b/src/ip6_bit.c
@@ -7,7 +7,7 @@
 
 #define BITSUBSTITUTION
 
-char strnum[FMT_ULONG];
+extern char strnum[FMT_ULONG];
 
 /**
  * This function converts a IPv6 address into its binary representation.
--- a/src/remoteinfo.c
+++ b/src/remoteinfo.c
@@ -50,7 +50,7 @@ static int doit(stralloc *out,int s,char ipremote[4],uint16 portremote,char iplo
 {
   buffer b;
   char bspace[128];
-  char strnum[FMT_ULONG];
+  extern char strnum[FMT_ULONG];
   int numcolons;
   char ch;
 
--- a/src/sslclient.c
+++ b/src/sslclient.c
@@ -98,7 +98,7 @@ static stralloc moreaddresses;
 
 static stralloc tmp;
 static stralloc fqdn;
-char strnum[FMT_ULONG];
+extern char strnum[FMT_ULONG];
 char ipstr[IP6_FMT];
 
 char seed[128];
--- a/src/sslhandle.c
+++ b/src/sslhandle.c
@@ -91,7 +91,7 @@ static stralloc remotehostsa;
 char *remotehost = 0;
 char *verifyhost = 0;
 
-char strnum[FMT_ULONG];
+extern char strnum[FMT_ULONG];
 char strnum2[FMT_ULONG];
 
 static stralloc tmp;
--- a/src/sslserver.c
+++ b/src/sslserver.c
@@ -87,7 +87,7 @@ char *verifyhost = 0;
 unsigned long uid = 0;
 unsigned long gid = 0;
 
-char strnum[FMT_ULONG];
+extern char strnum[FMT_ULONG];
 char strnum2[FMT_ULONG];
 
 static stralloc tmp;