Index: configure
--- configure.orig	2021-04-19 17:08:31.000000000 +0200
+++ configure	2021-04-21 13:46:26.551552000 +0200
@@ -14092,10 +14092,7 @@
 then :
 
 else $as_nop
-  { { printf "%s\n" "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
-printf "%s\n" "$as_me: error: in \`$ac_pwd':" >&2;}
-as_fn_error $? "C preprocessor \"$CPP\" fails sanity check
-See \`config.log' for more details" "$LINENO" 5; }
+    :
 fi
 
 ac_ext=c
Index: src/strlcat.c
--- src/strlcat.c.orig	2018-05-25 19:50:45.000000000 +0200
+++ src/strlcat.c	2021-04-21 11:04:12.693230000 +0200
@@ -28,7 +28,7 @@
 #include <string.h>
 
 #ifdef _LIBC
-# ifdef __weak_alias
+#if defined(__linux) && defined(__weak_alias)
 __weak_alias(strlcat, _strlcat)
 # endif
 #endif
Index: src/unvis.c
--- src/unvis.c.orig	2018-05-25 19:50:45.000000000 +0200
+++ src/unvis.c	2021-04-21 11:04:12.693379000 +0200
@@ -49,7 +49,7 @@
 #include <errno.h>
 #include <vis.h>
 
-#ifdef __weak_alias
+#if defined(__linux) && defined(__weak_alias)
 __weak_alias(strnunvisx,_strnunvisx)
 #endif
 
Index: src/vis.c
--- src/vis.c.orig	2018-05-25 20:09:38.000000000 +0200
+++ src/vis.c	2021-04-21 11:04:12.693519000 +0200
@@ -75,7 +75,7 @@
 #include <wchar.h>
 #include <wctype.h>
 
-#ifdef __weak_alias
+#if defined(__linux) && defined(__weak_alias)
 __weak_alias(strvisx,_strvisx)
 #endif