--- config/tcl.m4.orig	2020-03-04 19:29:59.000000000 +1100
+++ config/tcl.m4	2020-09-07 17:42:42.313533000 +1000
@@ -1540,6 +1540,24 @@
 	    UNSHARED_LIB_SUFFIX='${TCL_TRIM_DOTS}\$\{DBGX\}.a'
 	    TCL_LIB_VERSIONS_OK=nodots
 	    ;;
+	BSDSUniX-*)
+	    # BSDSUniX has ELF.
+	    SHLIB_CFLAGS="-fPIC"
+	    SHLIB_LD="ld -Bshareable -x"
+	    SHLIB_LD_LIBS='${LIBS}'
+	    SHLIB_SUFFIX=".so"
+	    DL_OBJS="tclLoadDl.o"
+	    DL_LIBS=""
+	    LDFLAGS="$LDFLAGS -export-dynamic"
+	    CC_SEARCH_FLAGS='-Wl,-rpath,${LIB_RUNTIME_DIR}'
+	    LD_SEARCH_FLAGS='-rpath ${LIB_RUNTIME_DIR}'
+	    if test "${TCL_THREADS}" = "1" ; then
+		# The -pthread needs to go in the CFLAGS, not LIBS
+		LIBS=`echo $LIBS | sed s/-pthread//`
+		CFLAGS="$CFLAGS -pthread"
+	    	LDFLAGS="$LDFLAGS -pthread"
+	    fi
+	    ;;
 	FreeBSD-*)
 	    # FreeBSD 3.* and greater have ELF.
 	    SHLIB_CFLAGS="-fPIC"
@@ -2097,7 +2115,7 @@
 		    ;;
 		IRIX*)
 		    ;;
-		NetBSD-*|FreeBSD-*|OpenBSD-*)
+		BSDSUniX-*|NetBSD-*|FreeBSD-*|OpenBSD-*)
 		    ;;
 		Darwin-*)
 		    ;;