Index: trunk/Makefile.conf.in
===================================================================
--- trunk/Makefile.conf.in	(revision 25709)
+++ trunk/Makefile.conf.in	(revision 25710)
@@ -19,6 +19,11 @@
 EXE=@/target/sys/ext_exe@
 PCB_RND_HOST_CC=@/host/cc/cc@
 
+# hidlib installation directories
+HL_LIBDIR=$(Install_root)@/local/prefix@/@/local/libarchdir@
+HL_INCDIR=$(Install_root)@/local/prefix@/include/pcb-rnd
+
+
 # The installation directoried to be used from within binaries (with
 # install_root/DESTDIR removed)
 LIBDIR_INSTALLED=@/local/prefix@/lib/pcb-rnd
Index: trunk/scconfig/hooks.c
===================================================================
--- trunk/scconfig/hooks.c	(revision 25709)
+++ trunk/scconfig/hooks.c	(revision 25710)
@@ -70,6 +70,7 @@
 	printf(" --dot_pcb_pcb=path         .pcb-rnd config path under $HOME/\n");
 	printf(" --workaround-gtk-ctrl      enable GTK control key query workaround\n");
 	printf(" --man1dir=path             change installation path of man1 files (under prefix)\n");
+	printf(" --libarchdir=relpath       relative path under prefix for arch-lib-dir (e.g. lib64)\n");
 	printf(" --all=plugin               enable all working plugins for dynamic load\n");
 	printf(" --all=buildin              enable all working plugins for static link\n");
 	printf(" --all=disable              disable all plugins (compile core only)\n");
@@ -147,6 +148,10 @@
 		put("/local/man1dir", value);
 		return 1;
 	}
+	if (strcmp(key, "libarchdir") == 0) {
+		put("/local/libarchdir", value);
+		return 1;
+	}
 	if (strncmp(key, "workaround-", 11) == 0) {
 		const char *what = key+11;
 		if (strcmp(what, "gtk-ctrl") == 0) append("/local/pcb/workaround_defs", "\n#define PCB_WORKAROUND_GTK_CTRL 1");
@@ -287,6 +292,7 @@
 	put("/local/prefix", "/usr/local");
 	put("/local/man1dir", "/share/man/man1");
 	put("/local/man1dir", "/share/man/man1");
+	put("/local/libarchdir", "lib");
 	put("/local/pcb/hid_gtk3_cairo/controls", sfalse); /* enable gtk3 only when explicitly requested */
 
 #undef plugin_def