fixed the same issue in dmenu

config.mk

@@ -1,5 +1,5 @@
 # dmenu version
-VERSION = 0.4
+VERSION = 0.5
 
 # Customize below to fit your system
 
@@ -11,7 +11,7 @@ X11INC = /usr/X11R6/include
 X11LIB = /usr/X11R6/lib
 
 # includes and libs
-INCS = -I/usr/lib -I${X11INC}
+INCS = -I/usr/include -I${X11INC}
 LIBS = -L/usr/lib -lc -L${X11LIB} -lX11
 
 # flags