--- src/libs/libpng-1.2.54/configure.orig	2020-07-10 02:58:18.000000000 +1000
+++ src/libs/libpng-1.2.54/configure	2020-08-21 16:14:24.017487000 +1000
@@ -5380,7 +5380,7 @@
     lt_cv_sys_max_cmd_len=8192;
     ;;
 
-  bitrig* | darwin* | dragonfly* | freebsd* | netbsd* | openbsd*)
+  bsdsunix* | bitrig* | darwin* | dragonfly* | freebsd* | netbsd* | openbsd*)
     # This has been around since 386BSD, at least.  Likely further.
     if test -x /sbin/sysctl; then
       lt_cv_sys_max_cmd_len=`/sbin/sysctl -n kern.argmax`
@@ -5788,13 +5788,13 @@
   lt_cv_deplibs_check_method=pass_all
   ;;
 
-freebsd* | dragonfly*)
+freebsd* | dragonfly* | bsdsunix*)
   if echo __ELF__ | $CC -E - | $GREP __ELF__ > /dev/null; then
     case $host_cpu in
     i*86 )
       # Not sure whether the presence of OpenBSD here was a mistake.
       # Let's accept both of them until this is cleared up.
-      lt_cv_deplibs_check_method='file_magic (FreeBSD|OpenBSD|DragonFly)/i[3-9]86 (compact )?demand paged shared library'
+      lt_cv_deplibs_check_method='file_magic (BSDSUniX|FreeBSD|OpenBSD|DragonFly)/i[3-9]86 (compact )?demand paged shared library'
       lt_cv_file_magic_cmd=/usr/bin/file
       lt_cv_file_magic_test_file=`echo /usr/lib/libc.so.*`
       ;;
@@ -10157,7 +10157,7 @@
       ;;
 
     # FreeBSD 3 and greater uses gcc -shared to do shared libraries.
-    freebsd* | dragonfly*)
+    bsdsunix* | freebsd* | dragonfly*)
       archive_cmds='$CC -shared $pic_flag -o $lib $libobjs $deplibs $compiler_flags'
       hardcode_libdir_flag_spec='-R$libdir'
       hardcode_direct=yes
@@ -11247,6 +11247,16 @@
   esac
   ;;
 
+bsdsunix*)
+  version_type=freebsd-$objformat
+  library_names_spec='$libname$release$shared_ext$versuffix $libname$shared_ext$versuffix'
+  need_version=yes
+  shlibpath_var=LD_LIBRARY_PATH
+  shlibpath_overrides_runpath=yes
+  hardcode_into_libs=yes
+  ;;
+
+
 haiku*)
   version_type=linux # correct to gnu/linux during the next big refactor
   need_lib_prefix=no