--- configure.orig	2016-10-02 18:19:29.235779000 +0200
+++ configure	2016-10-02 18:20:57.585596000 +0200
@@ -8054,7 +8054,7 @@
 esac
 
 case "$target_os" in #(
-  freebsd*) :
+  bsdsunix*|freebsd*) :
 
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether pthread should be enabled by default" >&5
 $as_echo_n "checking whether pthread should be enabled by default... " >&6; }
@@ -8065,7 +8065,7 @@
 /* end confdefs.h.  */
 
 #include <osreldate.h>
-#if __FreeBSD_version < 502102
+#if __FreeBSD_version < 502102 && !defined(__BSDSUniX__)
 #error pthread should be disabled on this platform
 #endif
 
@@ -8366,7 +8366,7 @@
 		$as_echo "#define BROKEN_SETREGID 1" >>confdefs.h
 
                 ac_cv_sizeof_rlim_t=8 ;; #(
-  freebsd*) :
+  bsdsunix*|freebsd*) :
     	LIBS="-lm $LIBS"
 		ac_cv_func_getpeername=no
 		ac_cv_func_getsockname=no
@@ -15542,7 +15542,7 @@
 esac
 
 case "$target_os" in #(
-  freebsd*) :
+  bsdsunix*|freebsd*) :
 
 	 $as_echo "#define BROKEN_CLOSE 1" >>confdefs.h
 
@@ -17627,7 +17627,7 @@
 			XLDFLAGS="$XLDFLAGS -Wl,-E"
 			LIBPATHFLAG=" -L%1\$-s"
 			rb_cv_dlopen=yes ;; #(
-  freebsd*|dragonfly*) :
+  bsdsunix*|freebsd*|dragonfly*) :
 
 			: ${LDSHARED='$(CC) -shared'}
 			if test "$rb_cv_binary_elf" = yes; then
@@ -17789,7 +17789,7 @@
 
 
 case "$target_cpu-$target_os" in #(
-  *-freebsd*|x86_64-netbsd*) :
+  *-bsdsunix*|*-freebsd*|x86_64-netbsd*) :
 
     for ac_header in execinfo.h
 do :
@@ -18364,7 +18364,7 @@
 
 
   case "$target_os" in #(
-  freebsd*|dragonfly*) :
+  bsdsunix*|freebsd*|dragonfly*) :
      ;; #(
   *) :
 
@@ -18445,7 +18445,7 @@
 	    LIBRUBY_RELATIVE=yes
 	fi
 	 ;; #(
-  freebsd*|dragonfly*) :
+  bsdsunix*|freebsd*|dragonfly*) :
 
 	SOLIBS='$(LIBS)'
 	LIBRUBY_SO='lib$(RUBY_SO_NAME).so.$(MAJOR)$(MINOR)'
@@ -18804,7 +18804,7 @@
             LIBRUBY_A_OBJS='$(DTRACE_GLOMMED_OBJ)'
         fi
         case "${target_os}" in #(
-  freebsd*) :
+  bsdsunix*|freebsd*) :
 
             # FreeBSD's dtrace requires libelf
             LIBS="-lelf $LIBS"