Setting this here will allow it to propagate through everything.

Index: unix/configure
--- unix/configure.orig
+++ unix/configure
@@ -7565,7 +7565,7 @@ fi
 	    CC_SEARCH_FLAGS=""
 	    LD_SEARCH_FLAGS=""
 	    ;;
-	OpenBSD-*)
+	OpenBSD-*|SecBSD-*)
 	    arch=`arch -s`
 	    case "$arch" in
 	    vax)
@@ -8854,7 +8854,7 @@ fi
 	    BSD/OS*) ;;
 	    CYGWIN_*|MINGW32_*) ;;
 	    IRIX*) ;;
-	    NetBSD-*|FreeBSD-*|OpenBSD-*) ;;
+	    NetBSD-*|FreeBSD-*|OpenBSD-*|SecBSD-*) ;;
 	    Darwin-*) ;;
 	    SCO_SV-3.2*) ;;
 	    *) SHLIB_CFLAGS="-fPIC" ;;
@@ -18827,7 +18827,7 @@ if test "$FRAMEWORK_BUILD" = "1" ; then
 elif test "$prefix/lib" != "$libdir"; then
     TCL_PACKAGE_PATH="${libdir} ${prefix}/lib ${TCL_PACKAGE_PATH}"
 else
-    TCL_PACKAGE_PATH="${prefix}/lib ${TCL_PACKAGE_PATH}"
+    TCL_PACKAGE_PATH="${prefix}/lib/tcl"
 fi
 
 #--------------------------------------------------------------------