diff --git a/config.def.h b/config.def.h
index 9efa774..06ae186 100644
--- a/config.def.h
+++ b/config.def.h
@@ -28,7 +28,6 @@ static const Rule rules[] = {
 	 */
 	/* class      instance    title       tags mask     isfloating   monitor */
 	{ "Gimp",     NULL,       NULL,       0,            1,           -1 },
-	{ "Firefox",  NULL,       NULL,       1 << 8,       0,           -1 },
 };
 
 /* layout(s) */
@@ -59,11 +58,13 @@ static const Layout layouts[] = {
 static char dmenumon[2] = "0"; /* component of dmenucmd, manipulated in spawn() */
 static const char *dmenucmd[] = { "dmenu_run", "-m", dmenumon, "-fn", dmenufont, "-nb", col_gray1, "-nf", col_gray3, "-sb", col_cyan, "-sf", col_gray4, NULL };
 static const char *termcmd[]  = { "st", NULL };
+static const char *slockcmd[] = { "slock", NULL };
 
 static const Key keys[] = {
 	/* modifier                     key        function        argument */
 	{ MODKEY,                       XK_p,      spawn,          {.v = dmenucmd } },
 	{ MODKEY|ShiftMask,             XK_Return, spawn,          {.v = termcmd } },
+	{ MODKEY|ShiftMask,             XK_l,      spawn,          {.v = slockcmd } },
 	{ MODKEY,                       XK_b,      togglebar,      {0} },
 	{ MODKEY,                       XK_j,      focusstack,     {.i = +1 } },
 	{ MODKEY,                       XK_k,      focusstack,     {.i = -1 } },
diff --git a/config.mk b/config.mk
index ef8acf7..caecc5a 100644
--- a/config.mk
+++ b/config.mk
@@ -7,8 +7,8 @@ VERSION = 6.4
 PREFIX = /usr/local
 MANPREFIX = ${PREFIX}/share/man
 
-X11INC = /usr/X11R6/include
-X11LIB = /usr/X11R6/lib
+X11INC = /usr/include/X11
+X11LIB = /usr/lib64/X11
 
 # Xinerama, comment if you don't want it
 XINERAMALIBS  = -lXinerama